Its sad to hear about accidents like this. I'll bet gramps is going through a living hell.
Unfortunatly you see this on home video shows to often. Although the artical states some sort of rigged hitch was used, many times the tubber lets go of the rope in a corner, like what a water skier does as he comes by shore, and they no longer follow to tow vehicle, they suddenly continue straight into what ever object is waiting. Usually the water skier ends up doing a face plant into the sand.
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