I kid you not, I could not kill a single Thrall even if I emptied the entire 37-round mag right into their dome. It made for some interesting firefights, though. Knights were basically mini-bosses that I had to empty at least 5 mags into to kill. It's like Randal the Vandal all over again. If you want a good laugh or you want to challenge yourself (maybe try taking down a Taken champion with just the Husk?), start farming Fist of Crota and get yourself a rapid-fire paper shooter to call your own.