Some actors will not break character during a shoot for fear it will diminish their performance. This means they may stay in character off-set and will speak and behave as they imagine their on-screen persona would. Wondering if that is the case here.
He was kidnapped in South Africa off the set of a film he was working on some years ago and ended up in the boot of a car for hours, terrified and expecting to be murdered. I think he managed to convince them to let him go, but I’m sure it left a mark. I wouldn’t be surprised if he now reacts viscerally when he sees someone else get ganged up on.
Dr. Strange would have just transported the attacker to jail.