On top of that, people have different natural reactions to danger cues. I remember reading some research a couple of decades ago about thrill seekers having a different reaction to loud noises. Apparently, most people initially flinch away from a sudden loud noise (like a bang), while thrill seekers (those who do dangerous things for fun) tend to initially orient toward a sudden loud noise. People who don't naturally freeze are perhaps well equipped for dangerous situations (including fights) from the start.I think I know what you mean. But I don't think it wise to restrict your statement to only a martial artist or a soldier. Anyone who is trainable can be trained to do things. The fewer things they are taught, the more time available for what is taught, and therefor the better at it they will be. Fight, Flight or Freeze, even that can be trained. And people do tend to do what they train to.
EDIT: Oh, I see Tez3 has already enlightened you.