But, even if not, the smart move for any pilot in this situation is to just extricate yourself from the situation without getting seriously injured. The legal problems that can arise from fighting in an airport or on an aircraft are just too serious. And what might happen if it turns out that the guy you fought was mentally handicapped, or on some sort of mind-altering medication? The company might decide that any PR hit from one of its pilots fighting such a person, even in self-defense, isn't worth it. Remember, the company doesn't care about you. So, they could terminate your employment, thinking that it will look better for them, and then wait for the arbitrator to order them to bring you back, which will happen a year later, after the media has stopped paying attention. No, lots of things to think about here, and none of them indicate that fighting back is a good idea. Just get out of the situation as quickly as possible and allow law enforcement to take care of it.