We helped to escape the prisoners in Hunters Edge and in the tunnel we met several poisonous mushrooms. After a while they were on fire surfaces and smoke, and we tried Bloodletting on one and we got the hell of it:
The fire surface extended to the whole level and the poison-cloud too. Then it exploded and the cloud came again and exploded again and this was going on and on in the same round of the fight. So we died, but it was fun.
no idea if this can be reproduced or if this is happening with differend poisonous foes too..