I want to see the end of the video where he's running in circles trying to catch the mower before it gets to the end of the rope....lol
Video was played at 4x the normal speed (as per the description on youtube), wouldn't have been hard to catch. It would have just wound itself tight against the stump and not gone anywhere, spun the wheels maybe, or just cut the engine if there is some safety feature built in if it can't go anywhere