I just kept teleporting him to the farthest corner possible, away from the fire. My mage has Far out man so I could send him pretty far away. There's a slope that will make him run for few turns before he could get to the fire so keep sending him there. Also if you have 2 characters that can teleport, send a weak enemy there with him too. He will then attack that instead.
This fight is so annoying, but you can teleport your entire team away from the fire and let enemies run to you. Most of the time they will hurt themselves pretty badly before even get to your team.
Last edited by Duckling; 21/09/17 07:53 PM.