Can Polymorph Potion be used to prevent your opponent from getting a level

[Flemroid]

Originally Posted by MunchkinMan

Please read the FAQ, Important Clarification #3 for an explanation of how these situations play out.

Does this also mean that if a monster instantly defeated that would give the munchkin level 10 you can wander in a monster that he/she would have to defeat in order to get the level?