 CONT: While Gen. Longstreet is talking to Col. Alexander Porter  during the bombardment of Cemetery Ridge on July 3rd, we see over  Longstreets shoulder a Rebel gun emplacement hit and a Confederate  gunner is thrown over the earthworks from the explosion. The camera  turns to Col. Porter for a brief second then comes back to  Longstreet. The same gun is shown intact, not yet hit, and the  wounded Confederate gone from the scene.