Once the grenade is within a decent blast radius of the opponent, its ribcage light then turns red and blasts them with a blinding white light that sends the opponent falling down rag doll physics style.
Enemies usually run away as soon as they see a grenade, so as soon as you toss one, you can shoot it with your gun to make it explode (accuracy isn't even that important).
To add insult to injury, it's flame proof and can and will bounce through any opposing grenade or rocket launcher blasts intact until it reaches and blasts its target.
The grenade launcher might seem like an intimidating weapon, but if you use it against someone, it will hardly do any damage unless you hit that person directly.
Those who want to own a piece of pop culture may be able to once again with the special edition collection of Frogskins done in styles such as Grenade.