That's certainly true of someone trained, and of someone who is in control of himself. The guy at the bar who decides you've been looking at his girl too long and goes around the bend will often over-commit in bigger ways. The limbic brain is not very good at risk assessment nor risk management, so the part about avoiding the consequences of the over-commitment is left out at that point.If you are fighting for the realz regardless of it being competition or self defence. then there is more over-commitment. You are also more likley to be more conservative and so not be as able to take advantage of that over-commitment.
So you are more likley to want to knock a guys head off with a big punch. But are less likley to want to risk eating that punch to counter with something clever.