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.
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That's kinda the point though. If you're not careful, there'll be consequences. It's pretty similar to if it was in Halo using a rocket launcher or fuel rod gun.