From the FAQ:
Quote:
Q. Can a Wizard use his charm ability if he's not involved in the combat?
A. No. The card says this is something he may do instead of fighting a monster. It's not for interfering with others' fights, so the Wizard in question must be the munchkin who opened the door or is helping.
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So you can't do it in somebody else's combat unless you are helping them in that combat. If you ARE helping them, though, I assume you
could charm away the monster whether they wanted you to or not...