Nod..No one has said that. Do try to keep up. The issue is self defense, not murder.
I'm sorry, I thought you just said the defense does not not need to prove anything about GZ. Are you saying the prosecution has to prove it was self defense?
The prosecution has to prove their charges 'beyond a reasonable doubt'. All the defense has to do is establish reasonable doubt. The defense is self defense. And all the defense has to do is to establish reasonable doubt about the prosecution's charges. Showing any or all the witnesses for the prosecution have testified in an untruthful manner goes a long was toward showing reasonable doubt.