The lurker

You hop down from the ledge about 30 feet from the men. You walk forward and step on a stick which crunches. Before they start shooting at you, you run behind a concrete barrier. You take out your pistol and start firing at them. They shoot at you, you then shoot back and take out about 10 men. You grab a grenade out of your pocket and toss it at the men. You had this gernsde for a little while. You throw it and kaboom everything and one explodes, but you see pronto managed to stay clear of the blast and he starts charging at you what do you do?