First off I know how to tank but been healing mainly lately, now, if your in Dusk Vigil don't think you can pull Longstop (HM) style, especially if you have only 1500 more hp than the healer, last night I was in a party with a DRK that decided to pull half of the mobs between the second and third boss wearing striking gear and blamed me (the healer) for him losing 10%-25% from each hit, DV isn't a place for large pulls unless your properly geared for your role.