Before I go for a run - what kind of ear witness accounts would help OP's version? I'm not being facetious, I'm genuinely curious. No screaming doesn't help because he screamed.
Edited to say : I mean Oscar says he screamed.
If they can get two independent unmarried witnesses who live close by to say they heard no screaming Roux might say they were mistaken and there was no screams like a girl from oscar. Just like double taps were the DT version until it was implausible and then Oscar remembered firing the gun in a different way!
Seriously though, I've wondered if the testimony of domestic staff is sought or considered in a case like this? In SA?
I don't know what kind of ear witness would benefit the defence.
One who says lights were not on in bathroom?
One who says no arguing?