Problem is proximity. Suppressor grenades are awesome but they have the worse AOE of all grenades.
And with fast hunters+crucible lag=you get the idea. Your timing has to be spot on. Even mag grenades piss me off because they'll land right next to a target and not lock on.
[spoiler]they're perfect on wizards and captains [/spoiler]
English
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Actually I think suppressor, flashbang, and incendiary are all the same range... Just a thought, no evidence. Probably though.
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In one of the examples, the grenade did damage on the enemy and the red aura popped up but the super didn't shut down because it was mid swing.