yeah, it's always hard to predict who comes out on top when things start to sting one another. I recently had a goniopora sting the living crap out of a frogspawn that was probably two or three inches away. I would have guessed the frogspawn to have a stronger sting. Goniopora also stung a toadstool, which didn't open up for about two weeks after (kind of a wussy little coral I guess).
I also think that a chalice I have actually stung the BTA and messed up some of its tentacles. Always some sort of warfare going down in there.