[MunchkinMan]

The monsters "win" when the player loses, and when the player loses, he has to Run Away. So, no, the Monsters do not have to catch the munchkins in combat, the munchkins just have to Run Away.

Now, if there are multiple players, it's still just one Level and one of them would have to die as a result of having to Run Away for it to be the winning Level.

I would, in fact, say that the wording, as is, is sufficient. If two players are in a combat and you aid the Monster(s), you are helping the Monsters against each player, so regardless of how many of them die, as long as one dies while Running Away, the Level you would get could be the winning Level.