Because there's nothing funnier than killing a titan in his bubble, and IF you're using armor of light you're a dumbass (blessing with illuminated >>>>>>>>> armor of light).
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I've one shot people with blessing. Armor of light is 3x as strong.
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Sure, shotgun/sniper headshot will most likely OHK you, but for small arms fire dipping into the bubble is amazing.
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^You beat me to it^