It was boneheaded out of both of them behaviorally. Don't need to slap regen pre-pull or even mid-pull-and keep doing it- if the tank has barely taken dmg or hasn't pulled all that many mobs yo begin with (second stretch of Ghimlyt comes to mind). Tank for reacting the way he did and quite frankly imo, not wanting to deal with. Yes it's annoying as hell but the only tank who should be truly be bitching about this is WAR as they theirs is a cone and in need to target first.