I agree with you that the court found that Oscar shot in putative self defence. It did not make a finding as to whether his mistaken beliefs were reasonable, but it did make a finding that he had those beliefs and they motivated his shooting, in other words, that his version was reasonably possibly true, or even stronger, that it was true.
OK - so at what lines in the judgement does the Judge run through test for self defence and say OK that checks all the boxes?
The problems with this really start on page 3327 where having reviewed the law, she finds his belief of danger to his life was honest but mistakenly entertained.
But the problem is that more is required for Self Defence.
Especially the force used must not be excessive in the circumstances as known to the accused
But she then simply skips over to a completely different concept as to whether he subjectively foresaw the possibility of death, despite having found he intentionally but mistakenly deployed lethal force.
So we have these bizarre passages which can't be reconciled:
How could the accused reasonably have foreseen that the shots
he fired would kill the deceased? Clearly he did not subjectively foresee
this as a possibility that he would kill the person behind the door, let
alone the deceased, as he thought she was in the bedroom at the time.
and
It follows that the accused’s erroneous belief that his life was in
danger excludes dolus. The accused therefore cannot be found guilty
of murder dolus eventualis.
But this is not correct. An erroneous belief his life was in danger does not exclude Dolus on its own.
What would exclude Dolus is Self Defence. So again lets look at the test.
5) Force must be necessary;
6) The extent of force must be necessary and reasonable.
5 & 6 apply to the facts as the facts as the accused perceived them. However where is the finding on these points?
Then we find this at 3332
However, there were other means
available to him to deal with what he considered a threat to his life.
Security personnel are there to deal with such stress or emergencies.
All the accused had to do was to pick up his cell phone to call security
or the police. He could have run to the balcony and screamed in the
same way he had screamed after the incident. He was able to call
security after the incident. There is no reason or no explanation why he
could not do so before he ventured into the bathroom with a loaded
firearm
and worse still
The accused had reasonable
time to reflect, to think and to conduct himself reasonably.
So those findings, based on the facts as known to the accused would appear to specifically rule out Self Defence
All in all this verdict is a mess
But I personally doubt any Appeal Court would support a finding of Self Defence when Masipa herself fails to clearly articulate such a finding.