Ana, I agree, but usually in those kind of cases it is clear that the killing was in self defence. At least, normally the killer has had had very good reason to fear for his own life or that of his family.
OP apparently shot 4 times at someone he couldn't see on the basis of a strange noise. As I have no experience of South Africa I cannot say whether he was justified in reacting so strongly but surely shooting at someone 4 times, suggests an intention to kill rather than disarm or disable?
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I am not questioning his defence, just saying that even if he had shot a burglar rather than his girlfriend, wouldn't that be a bit worrying in these particular circumstances?The supposed intruder was cornered in a very small room and plainly was not posing an immediate threat to OP or anyone else.
Basically it boils down, in my opinion, to whether it's ok to kill someone you can't even see, just because they might be an intruder who may become a threat to you.
It may be that in South Africa this kind of behaviour is acceptable and is not considered unduly violent. Indeed, I suppose from the fact that bail was granted that this is the case.