If your finger was being bitten off you would just calmly ask that the offender stop biting your hand, right?
If he had 1/2 a brain in his head, his finger would have never been in there in the first place. If you’re a machinist, would you stick your finger into a spinning lathe? If you’re an electrician, would you stick your hand into a hot circuit-breaker panel?
Then why the heck did this cop put his and anywhere *near* the perp’s head when he’s already well under control? It’s common sense.