with reference to that section of the crimes act its also important to note
"3.6 It is a precondition to the application of the defence that the prosecution has proven, beyond reasonable doubt, that the accused is otherwise liable for murder. That is, the prosecution must prove that the accused caused the death of another human being, and that he or she had the requisite mental state for murder at the time of the killing."
I'm not a legal student, but from my interpretation that means that as a precondition that person must have wanted to *kill* the person when intoxicated to be liable for murder. There is no way of proving that he actually set out to kill him when hitting him, particularly important to consider cos it was a single punch and most of the damage was caused by his head hitting the pavement. Not saying this means he is innocent, merely that it's not intent for murder