We can all say shoulda coulda woulda. Why he backed over the face when he could have made a trail? I like to keep the blade low, even when going over the hump on the float. Inexperience maybe..... lets try out my dad's dozer. I didn't see it happen, but I had parked an open cab D3, and went to the little plastic building. I left it running. Young fella jumps on. Floors the fuel feed, nothing, yanks the throttle, nothing.... lets off the throttle, then can't figure out why he can't make it stop. Hits what he thinks is the brake, makes a hard right into an open hole, comes out of the seat, face first into a hot exhaust, rolls off the hood, bounces off a spinning track turning like a conveyor belt of death and lands on the ground beside the machine. Hoe man hits her out of hear with a shovel. He was a lucky boy. Never sat on a machine again. Stuck to surveying he did