I have the same X-2 Segway and it's deceptively wide. The bulbous off-road tires stick out further than the mudguards. I've snagged them on several tree limbs, branches and masonary bits that sticks out just a few inches. I've been tossed off it a couple of times. I'd bet that is what happened. He was unlucky enough to be near a cliff. RIP.