Quote Originally Posted by Araxes View Post
No, do not use Regen on a pulling Tank. Shields are a better option. Regen often causes Mobs to run straight past the Tank and directly towards the healer which then causes the Tank to do full turnaround to fish the mobs away from you.
You're only talking about cases where the healer casts the regen at the very moment of aggro; if launched before/during the pull, there are no more problems now.