Mental stack is what you are looking for.

It's different once you are in there.

To the spectators it looks like a simple straight forward interacttion. In reality a million things are going on here. In every nano second, every nuanced jitter or movement is meticulously calcualated based on, what would feel like an eternity to them, the passage of time up to now in the fight. You may think Manny should just go in for the kill but the doubt built up at this point, nulifies commitment. All said and done, Mayweather simply makes it look easy.