Heard a good theory about the teleporting ogres, not sure how to prove it, but the theory is if you stagger them backwards too much, then they glitch off the map and then teleport. Try not to push them back so much.
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They just get stuck on the bombs. It's the same with every other enemy in the game. Ogres used to teleport in crotas end when they got stuck on the lights and rocks at the start. They teleport to the destination of its path. All of the AI do it. Probably due to the way bungie codes their game.