Speedrunning: Status Buffs and Aggro Management.

[Elim]

Tank should have clicked off the regen. Of course tanks can forget about it sometimes, but either way he should have noticed that you got aggro, stopped and used one overpower or something to snap it off you. Not saying you actually needed to use regen...

edit
As someone who mains a tank on his alt character, I will say that regen can get annoying. I've come across a lot of WHMs that apply or refresh regen during trash pulls or right after trash dies. They normally don't do it just once or twice, but throughout an entire dungeon, forcing me to constantly click off regen. Sometimes I'll get so annoyed at it that I'll simply click off regen every time I see it, even when it's used at the correct time. Screw you regen. Lol.