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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Wrong I ve been killed using nova bomb and killed a titan using there super it's just it happens very fast and they move fast and it make's it hard to stop them in time.