obviously things went really wrong but these officers didn't set out to kill a guy. I'm curious what was the plan? police make eye contact with a guy and he takes off so they have probable cause to chase and apprehend and search him. But once they found nothing illegal (folding knife is legal) they still arrested him and put him in the van. Why? What were they going to do with him once he got to the station?
It's possible the officers didn't know that the folding knife was legal to carry. They don't seem like the brightest bunch.