All it says is “in the case of self defense or emergency.”

It doesn’t mention what kind of self defense or emergency. You could argue that just resisting arrest and wrestling warrants self defense.

It does not say that the officer must be acting in self defense against a deadly weapon. It simply says self defense or emergency.

For example, in CA you can only use deadly force if you realistically fear for your life and feel like if you don’t use deadly force, you will be killed. It is explicitly written that way. This law doesn’t seem to elaborate on self defense or emergency. I don’t think this will stick if he gets a good lawyer.