There's a major bug with the Blood Queen Lana'thel encounter in all difficulties. Once a player was bitten by Vampiric Bite, he has this spell inside his spell book under "General" and he can use it everywhere, anytime, unless the player is a vampire or bloodthirst frenzy.
This bug is critical since it can be abused anywhere to encounter anything starting from pve, and also in pvp.
What should happen is that the Vampiric Bite skill (which is in the players' spellbook), Essence of the Blood Queen and Frenzied Bloodthirst should not appear outside of Blood Queen encounter and should be removed from the spell book once the boss is dead, or the raid is dead.
Essence of the Blood Queen - http://www.wowhead.com/spell=71473
Frenzied Bloodthirst - http://www.wowhead.com/spell=70877
Vampiric bite - http://www.wowhead.com/spell=71726
We're on rev 7e62c34
Thanks in advance.
confirmed on 9084311, reopen an issue
Confirmed on 86e3737
As the initial report says, sometimes players get the Spell Vampiric Bite into their Spell Book but i don't know how to reproduce it.
When this happens, that player can bite other players everywhere (even outside ICC) and the spell is only removed after he goes offline.