Whenever I played Halo and went on a killing spree in multiplayer, nothing killed my buzz like a random teammate splattering with a ghost…
Edit: Personally as long as they balance it out, I'd like to see it in PvP
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I feel like betrayals would become very common in certain PvP game modes such as control. The supercharged ability of the Titan and warlock would be a big concern because of the wide area of effect those powers have. Not to mention the warlock grenade.