A threat is a threat even when constrained.
I am a big boy and not easily intimidated. But, I was on a flight once with a very disruptive passenger seated in the seat ahead of me.
Even though the disruption was finally contained (not restrained) I was not at all comfortable for the remaining duration of the flight.
One eye on the xxxxxxxxxxx until we landed.
I doubt that I was the only one with those feelings.
Someone throwing punches? Get 'em on the ground as soon as practicable and then we can all relax.