One of my customers participated in the rescue. The worker was trapped under the mower - a John Deere zero-turn. With much struggle, he and a crew of non-English speaking Mexicans got him out. My customer removed his shirt and actually used it as a tourniquet on the injured man's arm. His hand had been crushed. I was nearby and checked out the accident scene. I'm not quite sure how it happened? The hill wasn't that steep. It appeared the machine was set-up for a rollbar but didn't have it fully installed. Had it been there, the guy might not have been hurt as bad as he was. Hmm... Lightning was happening, and that stuff scares me a bit after ever since a bolt blew the wood off a tree about 50 feet away from me a few years ago, so I was out of there quick. Anyway, be careful on hills with the riders guys, especially along any inclines near a creek or other body of water. It is possible to get killed this way if it rolls near water and you get trapped under the water with the machine on top of you. This company was doing a homeowner association common area and they had a national company type of look - not sure who they were. The rider was upside down on the grass when I saw it. Scary stuff! This sh*t happens. Be careful.