It's likely just lag.
The only thing that can stop a super is a nightstalker shadowshot or a Titan Suppression grenade, and those are pretty obvious.
But if it's failing on activation, you're probably just lagging a bit
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So, it turns out it's not lag. I generally have a pretty tight grip on my controller. Even more so in crucible. I constantly end up sprinting during gun fights and get myself killed. Apparently my "unresponsive" super is really just me accidentally triggering the "Ionic Blink" ability -- Left stick to teleport during Stormtrance.
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Oh haha well at least you know
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It's more like I start channeling and get 1 or two attack ticks before it stops, and I have to let go and re-press the triggers. -- which I suppose could still be lag related. I did not know about the Titan Suppression grenade, though. That could be it.