There was a move a few years ago to enshrine the right for Prosecutors to appeal factual findings in SA law but somehow it has got lost along the way and has never been incorporated in their CPA. Maybe this will give the powers-that-be the impetus to get this aspect moving again.
http://www.iol.co.za/pretoria-news/opinion/oscar-should-thank-his-lucky-stars-1.1755639
It's quite a difficult issue as you can also just end up rerunning the case which is pointless.
In the jury systems - you can basically only appeal if the factual finding was manifestly unreasonable, or if there are new facts.
So in this case I would argue that the finding that OP did not foresee the possibility of death is manifestly incorrect - but I am not sure you can go there in SA law.
Sometimes bad factual errors can be manufactured into legal errors which i think is what Masipa opened the door for when she found strange things without explaining the basis, and then linked findings to legal principals that make no sense.
So for example Masipa seems to say OP did not foresee death [FACT] because he thought reeva was in the bedroom, or because he thought his life was in danger would appear to be two instances where the judge misdirected herself based on the wrong considerations.
Misdirection is a legal error.
I don't think Roux has done a very good job of addressing the State's submissions myself - but of course this time it is him who doesn't want to play in the weeds