 The enemy continued to assault the element, engaging them with a rocket-propelled grenade and small arms fire.As enemy activity increased, Petty Officer Monsoor took position with his machine gun between two teammates on an outcropping of the roof.While the SEALs vigilantly watched for enemy activity, an insurgent threw a hand grenade from an unseen location, which bounced off Petty Officer Monsoor's chest and landed in front of him.