Truck Driver Trainee was putting on EE's coat as EE stepped out of the water truck cab. EE fell backwards and struck the handrail with EE's left rib area. EE was taken to the emergency room and got x-rays with negative findings on 12/6/24. The Trainee was x-rayed again on 12/10/24 and four non-displaced rib fractures on EE's left side were found.