Both the Titan and Warlock become invincible when they are preforming their power moves but the Hunter in completely vulnerable during theirs. I know it would be ridiculous to run around invincible with a 3 shot insta-kill gun but they should be invincible when summoning the golden gun to be even with the titian and warlock.
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Man I'm a titan and I got owned during my super several times lol. New to this whole pvp thing in this game, but it lots of fun!