Yeah boxers may not have trained for every aspect of mma but they are solid in what they know. If an mma fighter were to try and take a boxer toe-to-toe the boxer could easily exploit a mma fighter's usually sloppy stand up. I don't think the fight's over the moment the mma fighter takes the boxer to the ground either. He might not go into a guard but he will swing and do what he can to get out of there. If of course the mma fighter catches him in good position for a submission then the fights over. I tend not to find that finish as exciting as everyone else because it was really sloppy technique by both fighters. The one leaving his body wide open (a boxer would've collapsed a lung with that opening) and the other for running in thinking it was already over (a boxer with a finisher mentality may have done the same thing but i think may have backed off alittle when it was clear his opponent didn't have much left and would've wanted to end it standing instead of going for the way too common "throw alot of punches while the other guy is down so the ref stops the fight" finish).