I team with a ret (yeah lol,ret faceroll blah blah...truth is they aren't any more) who even when he keeps up freedom as much as he can, spams repent and hammer on the mana burns eventually they run out and I end up with something like hamstring or dese-lolskill-cration (that stuff needs a nerf) slowing me while the opposite priest just sits there spamming mana burn, normally I would line of sight it but when the dps is just hugging me and spamming slows I can't do anything. The ret can't get near the other priest due to the same slow (ok generally this is more a dk problem than a warrior or druid).
Similar with warlock/healer, what can you do about a warlock who just stands there spamming mana drain? Yes I can line of sight it or dispel it but in time (normally when I go to dispel fear on the ret) he connects and oom's me before the other healer.