Pan across the whole Gath army, it's early in the battle. As they advance, David swings his sling, looks for all the world like he's going to let it fly. Then stops takes three half stumbles to the right and kicks the entire sling, rock and all, over Goliath's army. It falls harmlessly and the men from Gath pummel David's army like there is no tomorrow. On a side note, one of the Hebrew soldiers is blown away by a child messenger from a much better army but later runs a pretty good sprint with nobody around and gets to move to Atlanta.