BIB Why was this wrong?
How could he have foreseen who would actually be killed ?
For DE he didn't need to know who would be killed, just that someone would. If he can't supply a lawful excuse absolving him of dolus, then it's murder.
At the very least, he knew there was an unknown human being behind the door. Even Roux didn't try to argue that he didn't know he'd very likely kill that person, so I shall assume you accept that much, right?
So, if he knew he'd kill them, then the question becomes did he know it was wrong to do so and reconcile himself to that? IOW, was there criminal intent?
This is where the PPD bit comes in. If the court accepts that defence, then it is necessarily accepting that, because of the circumstances and his fears, his intent was not criminal although he remains culpable because he was behaving irresponsibly, and not as a reasonable person would or should.
Where you seem confused is your belief that Masipa accepted PPD and by doing so automatically demolished the criminal intent before she'd even got as far as evaluating DE.
Firstly, it's not actually that clear that she did accept PPD...or if she even knew what that meant. She misdirected herself (as Leach pointed out) by stating that the accused said he never intended to shoot, in other words, raising a defence of PPD.
But PPD necessarily requires intent. You can't on the one hand claim you believed you had reason to act to protect yourself and then say that you didn't intend to act to defend yourself. It does not compute. It has to be one or the other.
Roux's argument is that she approached DE having already excluded intent to kill by accepting PPD - but PPD has nothing to do with intent, it's all about culpability. Intent is assumed. So his argument is baseless.
This means, that actually when she addressed DE she asked the wrong questions.
What she should have done (once DD was excluded) is say....
Right. He didn't mean to kill Reeva - he thought she was in bed. Fine.
So what about the unknown person he thought he was shooting at?
1) Did he know firing into that cublcle he'd kill whoever it was? Inescapably, yes.
2) Did he intend for this to happen...or, at least, take the risk that it would? Yes, because I believe he thought he had to (PPD)
3) Did he know this was unlawful and reconcile himself with that? No, his PPD defence absolves him of the necessary criminal intent.
However, he shouldn't have done it no matter how scared, so he is still culpable. Hence CH.
Using PPD to excuse him from intentionally killing was a misdirection and a mistake. Using Reeva's whereabouts to say anything about his intentions regarding the human being he knew was behind the door was a mistake.
HTH
By the way...be careful not to confuse intent to kill/harm with criminal intent. PPD assumes the first and absolves the latter.