Martyrdom

The Matrydom perk allows the player to drop a live grenade just before dying. The grenade cannot be cooked (holding a grenade to decrease the time of the explosion), so it will have a normal time fuse as an uncooked grenade. If u are already cooking a grenade while you die, two grenades will be dropped and the cooked will go off first.

The perk is very useful in close quarters levels, as well as small rooms where it is difficult for the enemy to exit in time to escape the blast.