Pin Puller is a takedown gear perk that lets you arm a grenade on an enemy during a Machete Kill. The body becomes a bomb for nearby soldiers.
During a Machete Kill, press the prompt to leave an armed grenade on the enemy. It blows up and can catch other soldiers.
Fun against groups. The blast is loud, so it breaks stealth.
Major Blast Protection keeps you safe if you are close when it goes off.