Hmm it isnt using any runes, But I think I might know the "problem". In the targetting prioritys we got fire elementals (FE) set higher then the demon itself, because it can get u trapped between the demon,FE and special area. So to avoid standing in the waves, we let the fe's be killed first. If a fire elemental is summoned behind the demon, and therefore unreachable, it will try to target the FE? and thats whats causing, the sorry not possible? Cant think of anything else, altho it shouldnt try to attack a monster thats unreachable, unless it see's the demon as "walkable"
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DarkstaR