Not really enough, but the trouble was I'd get three magisters in a row who'd be enough to take him out before I could act. No doubt a better strategist would be able to mitigate such eventualities, but... well, that's why I play on easy. :P
Fortunately sticking him in the cage kept him out of trouble, even though it was unlocked. I stuck the chest across the doorway to make sure he stayed in there but I'm not sure it was necessary.