Kyle Rittenhouse's defense

Ok I haven't been on Glow since I was TTC #1 about 4 years years ago please be kind. LOL

Lots of rumors on the internet of course but one plausible rumor is that Kyle Rittenhouse is going to use self defense as his defense in court.

I could see that happening for shots number 2 and 3 but not shot number 1. He is saying self defense because after the 1st shot he was chased and hit with a skate board.

My question is, if he does use this as defense of the 2nd killing and the 3rd shot, would that set a precedent for active shooters? Would active shooters be allowed to claim self defense after people try to stop them?

My opinion is once he had shot the first person he was the aggressor or attacker so claiming self defense should be shut down.