Must not be a very good roll then. From my experience, you should at least be able to take down half of their health in a burst if you're using it correctly, making it a 2-burst kill. Most Erentil snipes usually take 2 bursts. But if they're in your face or at least at Chaperone range, Erentil should be pretty lethal. Unless you get flinched or they're in the middle of a melee lunge. Flinch in any gun fight can mess you up bad and melee lunges on these servers are practically Blinks.