Sometimes video of officer-involved violence is damning to the officer, as with Derek Chauvin. Sometimes it makes the narrative more complicated, as with Kim Potter. And sometimes it comes to the officer& #39;s defense, which appears to be the case with this shooting in Columbus.

There& #39;s something perverse here. An officer shows up to a scene of a disturbance, and suddenly one girl is going after another with a knife.

If he just stands there and lets her get stabbed, that& #39;s not just unjust, it& #39;s a total dereliction of duty! And if he lets her get stabbed, it doesn& #39;t become a national news story where he becomes an instant national villain.

All we have right now is one body-cam clip. But based on what that shows and assuming nothing new and earthshaking, it seems like it& #39;s going to be really important for BLM activists to be clear-eyed and say loudly that this was a tragedy, but it& #39;s not "cop terror."