Try remove all bias you may have, and think of all the times you've seen these supers in the crucible. Which has the most kill potential? Which is the hardest to kill? Which is easiest to use?
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The way I see it. Blade barrage is a one time use super. If you die to it, big deal, get over it. Not like they gonna come back and kill you again along with the entire team....ahem.. Nova warp on the other hand; is a roaming super, with 10+ thundercrash sized explosions (no exaggeration) with health regen and 2 different blink abilities to close the gap incredibly fast. People who are putting blade barrage on the poll are just plain mad that they got killed by it in comp once or sommat. If a warlock activates nova warp within atleast 40 entered of you, you’re dead.