It proves that you are lousy at law enforcement if arrest someone you believe to be in the act of insurrection, handcuff them, walk them to the door, take off the cuffs, high five them, and let them walk away.
Unless, he was an actor.
Not like Hollywood, but a federal agent/asset, arrested for show, in order to rile up the mostly peaceful demonstrators.
You can watch the videos and display your own cherry pickins.
You don't see that bit of video as odd?
Why not? (Yes, I already know you will say you do not think it strange at all 🤭)