Any kind of elevation doesn’t just break fire breath, it breaks deep breath to lol. Also a funny interaction with evoker chrono loop pvp talent, if you chrono loop a evoker and it deep breaths, when it goes back, it will be stuck in a deep breath animation in place for like 3-4 sec lmao.
At 70 devastation will have some other dmg with big living flames they can setup, and also if they get procs from fire breath can be instant. So they will have some other means of dmg.