Here are my thoughts. The weaver kid left the party early on foot. I have a feeling the kid may have said something to the accused about telling his dad what was going on.If the shooter was indeed drinking and I understand that alcohol was involved, the he may have boasted something to the effect of, “tell him to come on, I’ll kill his ass if he comes here”. Not saying that’s what happened but that statement or one like it could be used against him.
One other obvious scenario. Weaver was shot twice. once in the side and once in the chest. If it is determined he was shot the second time after he was already down on the ground,and no further threat, that would also be murder and premeditated..