The same person won't even react the same way in multiple situations. The whole idea of "bravery" isn't really a thing -- there are certainly impulsive people but those are also the people who will dive off the roof at the high school party. They aren't brave -- they have a profound stupidity which under rare circumstances might be useful.
Likewise, there are "calculating" people -- basically, people with a little bit of grey matter -- but even they react emotionally and might throw themselves in front of a stranger's baby. It all comes down to what you ate for breakfast, whether the wind is blowing from the right direction, etc.
This is of course heresy to the "this is my rifle this my gun" types, but, well... f-ck em. Study harder.
Charles Bronson is right in The Magnificent Seven. The farmers are the true "brave" and "strong" people because they burn themselves out over years for someone else. The guy who runs into a burning building is more likely than not just an idiot who will also run out on his child support payments. Now, I do want that idiot around specifically if my daughter is in the burning building, but I want him far, far away from her in the other 99.999% of cases because the moron will just wind up getting her hurt.
And I surely do not want him ever, ever holding a gun.