THE INJURED WAS RIDING A MANBUS. THE BUS WAS HAVING TROUBLE PULLING A STEEP INCLINE. ANOTHER BUS WAS BROUGHT TO THE SCENE TO AID THE TROUBLED BUS UP THE HILL. WHILE ON THE INCLINE THE TROUBLED BUS ROLLED BACKWARD AND STRUCK THE SUMMONED BUS. THE INJURED SAW THAT THE 2 BUSES WERE GOING TO HIT. THE BATTERY SLID & CAUGHT FINGERS BETWEEN.