Yea back when Bismarck was actually current content then yea the LB3 was for his back and should have been used by one of the melee but since everyone is wayyyy over geared for that easy fight then who cares when you used it I'm sure he still died in under 6mins and if he didn't that means dps was really bad...since Ravana takes about 4mins now lol

in most cases the boss always gets lb'ed but sometimes it's a specific add or group of mobs that either stress a fight or could cause a wipe