Why did my gladiator lose, he had more health than his opponent?

This is a very common question so I think it needs it's own thread. :)

Q: Why did my gladiator lose, he had more health than his opponent?
A: Once a certain threshold is hit the Enforcer will start thinking about saving your gladiator and preventing him from dying. Sometimes both gladiators will be past that threshold and based on numerous factors (the Presence attribute being a big one) the Enforcer will stop the fight and save your gladiator even if he has more health than his opponent. Sometimes he just doesn't want to take the chance that your gladiator's opponent gets in one last lucky hit and sends you to an early grave.