I noticed that spike grenades on nightstalker with the perk that doubles the duration (forgot the name) have a small bug where the void cone disappears after the regular time ends, so for the second half of the duration the cone becomes invisible but still does damage.
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Yeah it's a problem that does need fixed. I don't have problem with the grenade but this is a graphical glitch that can get you killed. While I learned to just watch for the actual grenade to disappear, it's still dumb to leave it alone.