i know at least DP shouldn't break it and mind flay, DB is a special disorient. it's not exactly like roar.
but idk about death, i dont play priest. i just reported it cause you told me, and it was pretty logical that it should break, at least for me. so i dont know. would be weird and too easy to counter a fire mage tho, as you can only breath into sheep. if you remove breath from a fire mage, well what?
anyway, i will let this discussion be between you guys.