Two employees were unloading two pallets from a box truck. As they placed the second pallet onto an electric hand truck, the rear wheels rolled over the dock bridge plate, which caused the front of the plate to tilt up and the hand truck to become stuck. The injured employee attempted to push down and hold the bridge plate by the handle on the left side to free the hand truck and as the hand truck operated it caused the bridge plate to twist and pinch their left fingers between the bridge plate and the back of the truck. The employee's left index finger was injured.