I agree that it would be very helpful to have a legal analysis of the Heads of Appeal, but, as far as I can see, there isn't much out there at the moment.
Here is a link to the 2014 court of Appeal case of
Mkhize v S (16/2013) [2014] ZASCA 52 (14 April 2014):
http://www.saflii.org/za/cases/ZASCA/2014/52.html
The case is interesting because the appellant's murder conviction was set aside by the Appeal Court and replaced with a conviction for culpable homicide, despite his use of excessive force:
‘In the final analysis, a Court of appeal does not overturn a trial Court’s findings of fact unless they are shown to be vitiated by material misdirection or are shown by the record to be wrong.
[15] The test that applies, and what was required to be shown by the appellant in order to avoid a conviction on culpable homicide is that a reasonable person in the same circumstances in which he found himself would have believed that his life was in danger and would have acted as he did.[5] The only issue was whether the State had proved beyond reasonable doubt that the appellant did not, subjectively, entertain an honest belief that his life was in danger and thus not justified to act in putative private defence...
A further aspect that remains for determination is whether, despite the appellant’s subjective belief that if he did not react as he did he would have been killed, it was necessary for him to shoot the deceased three times. The first shot would, in all probability, have had the desired effect to ward off the unlawful attack on him.
In my view, the appellant, especially as a long serving police officer with considerable experience in handling firearms, ought to reasonably have realised that he was using excessive force beyond the legitimate bounds of private defence. In the circumstances, he should have been convicted of culpable homicide. Counsel for the State fairly and correctly conceded that the evidence viewed in its totality, failed to establish that the appellant had the requisite intention to kill the deceased. The appeal against the conviction ought, for the aforesaid reasons, to succeed...'
So, although the appellant failed the three stage test for PPD, he still managed to avoid a murder conviction on appeal, as a result of the Appeal Court's finding that the State had failed to prove beyond reasonable doubt that the appellant did not entertain an honest belief that his life was in danger.
Quite why the State conceded that it had failed to establish that the appellant had the requisite intention to kill is unclear.
However, if the reasoning in
Mkhize v S were to be adopted in
S v Pistorius, the appellate court will need to reverse Masipa's finding that OP's intruder-belief story was reasonably possibly true in order for him to be found guilty of murder.