[MunchkinMan]

Bear with me while I try to figure out how best to answer this. It can kind of go either way, depending on what cards were played. I also know that, at least in Munchkin, there are cards which allow the main combatant to leave and the helper still has to finish out the combat. I want to look through the Quest card database tonight and see what cards move people around, even during combat, and how they're worded to see if we have any clues about how the generic case should be handled.

My first instinct, however, is that if the main combatant bails using some card to instantly get out of the combat, the combat is over and the helper is stuck with taking a hit per Monster and having to Run Away unless the card used to get the main combatant away says something else.