The Republican sniper had medical knowledge from training that helped him, for the rest of his life. An opposing sniper on a rooftop targeted and shot the Republican sniper. The shot had left his arm immobilized, and left him in a lot of pain. Since the bullet was still in his arm and most likely fractured the bone, the Republican sniper saturated the bullet hole with iodine to prevent infection and clean the wound. Then, he covered the wound in a piece of cotton and added the dressing over it. If the sniper wasn't experienced, then he wouldn't know to add the iodine to his wound. When the military is training the soldiers, it is taught to keeps cuts and opening in the skin clean at all times, so they don't die from infection. The training