I guess it depends on how many rounds they sent down range. The old spray and pray method?
Watched the video, I counted 22 rounds being fired and the officers were shooting from multiple directions. My guess is that they will determine he was shot by more than one of these bad cops.
The officers were in no danger from the knife. The innocent bystander was clearly the most endangered but was he in more danger from the guy with the knife or from the crazy gunfire from the officers. I would say the gunfire was worse.