allow friendlies to get in combat with hostile again
It used to be the case I think, but I just wasted a few minutes trying to get a berserker lord to engage combat with a cat. It could be super bad luck that it didn't try to step onto the cat's tile but I don't think so...
*EDIT seems they actively avoid the tile if they can, but they'll engage in combat if forced into a corridor. I was trying it in the big room...