That actually might be a physics bug, I've killed plenty of people with sleeper and it goes right through sword shields. Also, i'm guessing by the fact that you didn't lose any ammo when the shot hit, at least, you should have lost at least some if not all. Hilarious none the less though, I bet that guy was mad.
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It was a blocked hit since I lost health on the shot, there must be some glitches related to sleeper we are not aware of since its a new type of weapon (fusion heavy)