cusso ken
Living Legend
I have only ever seen something like this happen once ,when a bloke we were riding with his axle lost the nut and wound out until it cleared the swing arm on one side , the chain pulled the rear wheel sideways that induced a similar tank slapper and rear wheel lock up ,nasty thing to happen and nothing he could do to control it luckily he survived with a bit of bark off and required a change of underwear.