Its happened many times - I throw a grenade in PVE, it lands on an enemy, they hunker down for the explosion, and then...nothing.
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This happened to me last night in the hard raid. Went through the Venus portal to grab the relic after killing the gatekeeper. Threw a solar grenade down on all the minions. Nothing. Pissed me off. And my grenade had to recharge then.
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What type of grenade, the axis bolt and arc grenades miss when the enemy crouch, stickies should otherwise explode.