Prosecution should've pressed more on the "he racked his rifle" testimony. I can't find the other video, but the long video (starts from behind the mob, runs through Rittenhouse reaching police) shows:
- Rittenhouse shoots Skate&Die
- Grosskreutz stops advancing and puts his hands up
- Rittenhouse in sitting position
- Man walks between camera and Rittenhouse
- Grosskreutz advancing, Rittenhouse shoots him
At least in this video I think the prosecution could sow sufficient doubt that:
- Grosskreutz stopped and raised his hands
- Rittenhouse attempted to fire (impossible to definitively determine w/proper finger squeeze at that distance on that video)
- Rittenhouse "racked" rifle after failure to fire
- Grosskreutz advanced since at that point Rittenhouse was already trying to shoot him
I'd still consider it 100% self defense in light of everything else, but with what the prosecution has to work with at this point I think it wouldn't hurt their case to argue that Rittenhouse attempted to shoot a surrendering Grosskreutz