My conclusions
20 The principles applicable to the exercise of the Court's broad costs discretion are well established: see Minister for Immigration, Citizenship, Migrant Services and Multicultural Affairs v PDWL (costs) [2021] FCAFC 75 at [14]-[16]; Summers v Repatriation Commission (No 2) [2015] FCAFC 64 at [13]-[14]; Automotive, Food, Metals Engineering, Printing and Kindred Industries Union v ALS Industrial Australia Pty Ltd (No 2) [2015] FCAFC 123; 235 FCR 366 at [4]. I set out the relevant principles, with particular reference to the context of an applicant seeking to secure their liberty, in Bowman v Commonwealth of Australia [2022] FCA 594 at [60], citing Cabal v United Mexican States (No 6) [2000] FCA 651; 174 ALR 747 at [22]; MB v Minister for Immigration, Citizenship, Migrant Services and Multicultural Affairs (No 2) [2021] FCA 559 at [3]-[5]; Minister for Immigration, Citizenship, Migrant Services and Multicultural Affairs v MB [2021] FCAFC 194 at [19]; see also DBE17 v Commonwealth of Australia (No 2) [2018] FCA 1793 at [22]-[23].
21 The applicant has succeeded in securing substantive relief in respect of both the 2018 ASA and 2020 ASA, and in respect of the protection visa decision adverse to him. Given the current state of the law as set out in Commonwealth v AJL20 [2021] HCA 21; 95 ALJR 567 (AJL20 (HCA)), that is likely the maximum relief that he could have expected to secure. In that sense, he has been substantially if not wholly successful in terms of the outcome of the proceeding. In a straightforward situation, on usual principles costs would follow that event and he would receive compensation for his legal costs of the proceeding as a whole.
22 However, the course of this proceeding has been far from straightforward: see the primary reasons at [10] and the earlier reasons there referred to. In the 11 March 2021 decision permitting amendments to the applicant's pleadings (Plaintiff S111A/2018 v Minister of Home Affairs (No 3) [2021] FCA 207), I said at [18] and [25]:
The interlocutory debates between the parties need to cease. While it is important that parties be able to advance their cases, and are aware of the case they have to meet, in this proceeding both sides have had plenty of time to acquaint themselves with these matters. The incessant inter-party squabbles, the pages and pages of correspondence, and the nice legal arguments, have not advanced the circumstances of the applicant one jot. He remains detained without his allegations of false imprisonment having been determined. It is his liberty at stake, and on both sides there appears to have been insufficient regard paid to this fact. Whether or not his case succeeds, he is entitled to have it tried, and tried with relative efficiency, and at a cost which is proportionate to the length and complexity of the ultimate trial. It is clear the respondents are unlikely to recoup any legal costs from the applicant and the time has come to cease running up costs on interlocutory and preliminary matters.
….
I consider the point has been reached in this proceeding where the need to get the matter on for trial, and to facilitate compliance with existing orders of the Court, overwhelms other considerations. In a perfect world with two fully funded parties and numerically strong legal teams at their disposal, a trial may well much more closely resemble the adversarial, gladiatorial style of the past. Encouraging that kind of process is inappropriate to the circumstances of a proceeding such as this. To the extent the proceeding has been conducted in this way to this point, the history of the proceeding is the best evidence of its failure. The applicant remains deprived of his liberty more than three years after he commenced this proceeding alleging his detention is unlawful, and there has still not been a trial, but no doubt the respondents' legal costs are already very high. All for what the parties jointly say to the Court is a three day trial. That is not an effective and efficient use of anybody's resources, and especially not public resources, on the side of the respondents and the Court.
23 This proceeding has been hard fought, and I accept the applicant's submissions that there has always been a real disparity of resources as between the applicant and the respondents: see my findings to this effect set out above, and also at Plaintiff S111A/2018 (No 3) at [21]. I accept that the disparity in resources was responsible for at least some of the delays in compliance with the Court's timetabling orders, although as I have said in previous judgments in this proceeding, that was not a complete explanation. Taking that disparity of resources into account, I am not prepared to characterise the conduct of the applicant's case as sufficiently unreasonable that he should be denied compensation for most of his costs, which is the effect of the respondents' proposal. This has always been a complex and difficult case, and the reformulation of it as factual circumstances changed, particularly after the 2020 ASIO assessment and after discovery, was to be expected.
24 The disparity in resources, and retaining counsel prepared to appear for the applicant under constrained circumstances, may have contributed to at least some of the lack of focus in the proceeding, and to the fact that the case for the applicant was not really settled until leave was sought in early 2021 to rely on the second further amended statement of claim, an application which was granted in substance: Plaintiff S111A/2018 (No 3).
25 While I agree with the respondents that the applicant should not be compensated for his costs for the whole of the proceeding, and that an appropriate way to achieve that outcome is to fix a date after which the applicant should be compensated, in my opinion a fair and just costs outcome in this proceeding requires somewhat more nuance than fastening on one date to give effect to that overall view, as I explain below.
26 As a matter of general principle, it is relevant to the exercise of the Court's cost discretion that the proceeding concerned the applicant's liberty. He and his family were detained for a long period of time before being allowed to apply for a protection visa. The applicant's detention continued for a long period of time while the protection visa application was processed; more than three years. He then continued to be detained because the protection visa was refused - not because of non-satisfaction as to Australia owing him protection obligations, but because of an adverse ASIO assessment (the 2018 ASA). This assessment also meant he was not released into community detention, with his family. Where a proceeding concerns a person's liberty, the Court must be careful not to make costs orders which may have a chilling effect on other persons seeking to advance arguments designed to secure their liberty: see Bowman v Commonwealth of Australia [2022] FCA 594 at [60], citing Cabal v United Mexican States (No 6) [2000] FCA 651; 174 ALR 747 at [22]; MB v Minister for Immigration, Citizenship, Migrant Services and Multicultural Affairs (No 2) [2021] FCA 559 at [3]-[5]; Minister for Immigration, Citizenship, Migrant Services and Multicultural Affairs v MB [2021] FCAFC 194 at [19]; see also DBE17 v Commonwealth of Australia (No 2) [2018] FCA 1793 at [23(a)]-[23(b)]. An outcome of that kind is not in the interests of the administration of justice.
27 Further, as a matter of general principle, where an applicant commences or continues a proceeding on the basis of the law as it then is, and during the course of the proceeding, the law changes, amendments made to reflect the changed law are not matters outside the compensation to which a party having the benefit of the usual order as to costs should be entitled. Amendments of pleadings to reflect changes in the law are responsible conduct by a party, not unreasonable conduct. That is what happened here with the decisions in the AJL20 proceedings first by this Court and then by the High Court: see AJL20 v Commonwealth [2020] FCA 1305; 279 FCR 549; AJL20 (HCA). The same is true of changes to pleadings to reflect changes in the factual circumstances underpinning causes of action. That is what happened in the present proceeding, as the sequential decision-making by or on behalf of the executive about the applicant and his family took shape, and changed shape. In a factually fluid situation of some complexity, amendments of pleadings to reflect changes in the law are responsible conduct by a party, not unreasonable conduct. The applicant was not in control of the timing of any of that executive decision-making.