Yeah I've seen that one too, like the Spartan turned his head to look at me. I assumed it was a glitch because that has never been on the list of unlockables before.
These grenades begin detonation on impact, so they are good for throwing directly on the enemy, draining their shields and you pop em in the head. IMO they are far from useless. These grenades are amazing, and I understand why you only start out with one unless you use the Grenadier package. They are just that good.
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