3. How the actual Decision is ascertained. - It is always necessary in a case like the present to go further and inquire what was the precise want of jurisdiction which the discharging Court determined. It may have been limited to one stage of the proceedings, and, if so, imprisonment at another stage would not be for the same cause. It may have been limited to the need of some prior authorization for a warrant, or to some other necessary condition precedent. Those defects being afterwards supplied, a second imprisonment would not be for the same cause. But it may have been a total and incurable want of jurisdiction on the part of the committing tribunal to issue any process against the applicant, or to try him on the charge, that is, even to entertain the proceedings against him on that charge. If so, any subsequent attempts by that tribunal to proceed on that charge against the person discharged is a usurpation of the King's justice. And that is precisely the position here. Unless there exists some screen of technicality which obscures judicial vision, the most casual inspection of the judgment pronounced by Roberts J. makes perfectly plain the ground for Wah On's discharge. The learned Judge says: "This motion was based upon the applicant's claim that he is a member of the Australian community, and therefore not an immigrant within the meaning of the Immigration Act, and not amenable to the jurisdiction of the Magistrate's Court." He also says: "I must decide whether the commitment was made with jurisdiction, or whether the inferior tribunal was and is incompetent to deal with the applicant at all." It is therefore transparently plain that the issue was whether the imprisonment was illegal on the "ground" or for the "cause" that the Magistrate's Court was incompetent - that is, had no jurisdiction - to deal with Wah On at all. It was not that the want of jurisdiction was in relation to the interlocutory commitment only, but that there was a total and absolute want of jurisdiction, of which the particular commitment was only an incident, and its fate was involved in the general incompetency of the Magistrate's Court. This is an illustration of the distinction made in Kwok-a-Sing's Case[39]. Roberts J. has thus stated the issues, examined the facts and the law, and stated his reasons for the conclusions at which he ultimately arrived. His conclusion - that is, his decision as to the wrong of which the applicant complained - is stated in these words: - "My conclusion is that when the applicant landed in Australia in 1924, notwithstanding his long absence, he was returning to an old home which he had never abandoned. He was not an immigrant within the meaning of the Immigration Act 1901-1925. ... As the applicant is not a person amenable to the Act, the Special Magistrate has no jurisdiction to try him, and therefore no power to hold him pending trial." That was the decision. Then followed the legal consequence in these words: "The order will be made absolute" - in other words, "discharge." Which are the reasons and which is the conclusion is not, to my mind, a doubtful matter. I do not think that question vital, because, as I shall show, reasons that are involved in the decision are just as potent for present purposes as the summarized decision. But of the two factors decided by the Supreme Court, namely, (1) that Wah On was not an immigrant, and (2) that the Magistrate's Court had no jurisdiction to try him on the pending charge, it is not rationally possible to say that the first was the ultimate decision as to his right to freedom, and the second was the reason for the first. A Court that so reversed the order of thought would not simply err, it would invert the process of reasoning. It is equally plain, however, from the direct reading of the learned Judge's judgment, that he held, as his ultimate decision as to the substantive right to liberty, that the Magistrate's Court had no jurisdiction to try him, for the reason that the applicant was not an immigrant. Both conclusions were arrived at, but the "non-immigrant" factor was necessarily the initial step declaring innocence and leading up to the decision as to the right to freedom, and the "non-jurisdiction" factor was the final and ultimate step in that decision based on the first conclusion and declaring immunity from the Magistrate's jurisdiction, and being the decision that determined the illegality of the detention complained of, and that called for the automatic remedy of discharge.