Every time I use Dark-Drinker's R2 attack when enemy NPCs are in a stagger animation, the damage is reversed after a few seconds and more often than not I'll be killed. I have to avoid using the attack, since I never know whether or not damage is going to proc or if I'm just putting on a fancy light show in a crowd of minotaurs. Bungie, if it could be fixed soon, that'd be great, as I still love the sword and worked hard to get it.