Junior Dragster...

Why yes I can. They kill the ignition momentarily to bring the rpms back down. They feel that the clutch starts to grab the belt higher in the sheaves after the burn out and by lower the rpms it resets the clutch back to its almost rest position. If the belt is in different positions at the hit. The launch rpm will be different. You will also see some crew chiefs push the car backwards a few feet after the burn out. It effectively does the same thing.