In my career as a double, a lot of my job is to not just do the fights to make them look cool, but also to appear as the same person as the actor I am playing.
The thing that I come across is that people think that I might actually be super aggressive, want-to-fight type in real life. The irony is that that's just not true, at all.
I like the debate, but I don't really like the fight. I don't like being in the ring. I'm not competitive.
What really sells a fight, and any kind of action, is the performance of it. If someone is uncomfortable or uncertain about doing action because they're too concerned about their safety or about being right, it pulls them out of being that character, in that situation.