Jess thats a bit of bad luck.

I was lucky as a similar thing happened on my old XTR, had been out for a good 45min ride on country roads so was on and off the throttle alot and the chain was slightly more slack than standard but nothing overly bad. Came around a corner asked for the power and a massive racket. Lucky enough i was only doing about 30mph, free wheeled and pulled over straight away to find the chain had come off and was rolling over the hub of the wheel. No real damage apart from a few bits of paint on the chain stripped.

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Plough on