Originally Posted by Bashiok

Right now if you knock down a wall on top of, or drop a chandelier on the head of someone in your party, it does damage/"daze" them. There's some potential issues with it, right now it's sort of just there because of the way those object interact with player characters as a whole. It's possible that due to exploitative or griefing potential they just can't continue to work that way. We'll see.

Enemies will destroy some/most destructible objects if they're in their way. Whether that may include actual damage dealing destructibles or not is probably more of a design decision on a case by case basis. We sort of want to reserve that for the player too I think, being able to damage enemies with the destructbles, but specific creatures that use the environment to their advantage are always cool.