It was an almost unimaginable situation earlier this year when, in Alabama, a man boarded a school bus, killed the driver and abducted a child. The man then held the victim hostage in an underground bunker for days until FBI agents rescued the child.It’s for situations like that the Hall County SWAT team practiced on Tuesday. “It’s if we have some kind of incident on a bus, what might be some of our best ways to approach it and try to resolve the problem,” explained Capt. Joe Carter, SWAT commander.