The conclusion that a person is guilty of murder if he commits a fatal act knowing that it will probably cause death or grievous bodily harm but (absent an intention to kill or do grievous bodily harm) is not guilty of murder if he knew only that his act might possibly cause death or grievous bodily harm is not only supported by a preponderance of authority but is sound in principle. The conduct of a person who does an act, knowing that death or grievous bodily harm is a probable consequence, can naturally be regarded for the purposes of the criminal law as just as blameworthy as the conduct of one who does an act intended to kill or to do grievous bodily harm. Indeed, on one view, a person who does an act knowing its probable consequences may be regarded as having intended those consequences to occur. That view was expressed in Reg. v. Hyam [14] by Viscount Dilhorne, Lord Diplock [15] and possibly by Lord Cross of Chelsea [16] , although Lord Hailsham of St. Marylebone L.C. [17] denied its correctness. There is other authority in favour of the view, including some of the cases mentioned in Archbold's Criminal Pleading, Evidence and Practice, 41st ed. (1982), pp. 995-1001, and the passage from Kenny, Outlines of Criminal Law cited by Dixon C.J. in Vallance v. The Queen [18] . It is however unnecessary to enter upon that controversy. If an accused knows when he does an act that death or grievous bodily harm is a probable consequence, he does the act expecting that death or grievous bodily harm will be the likely result, for the word "probable" means likely to happen. That state of mind is comparable with an intention to kill or to do grievous bodily harm. There is a difference between the case in which a person acts knowing that death or serious injury is only a possible consequence, and where he knows that it is a likely result. The former is not a case of murder even if death ensues, unless death or grievous bodily harm is intended (or, perhaps - and it is unnecessary to consider this proposition - unless the act is done with the intention and for the sole purpose of creating a risk of death or grievous bodily harm).