On the moon i punched a vandal off a cliff but he flinched at the same time and was floating in the air. Ive also encountered vex that can move and shoot but are invisible, but not like fallen invisible, their character model is not present except for the glow of their eyes and the cant die. Also sometime in crucible i melee kill person, but they dont die, then they kill me, then they die and then it says i killed them. The last one is probs just lag but i thought id put it down