Often, fighters are not really present in the fight. They are just acting out what they choreographed in practice. If they practiced to give themselves space and pick their shots when the opponent is confused and concussed, then that is what they would do in a really fight situation.
I think they practice to jump on the opponent when they smell blood, in hopes that they will KO the opponent once and for all or the referee will stop the fight because it looks like they are beating up on a defenseless opponent.
A good example is Robert Lawler versus Ben Askren. Askren was out of it, and Robert Lawler woke him up, instead of creating space and picking his shots to finish an opponent who was out of it.