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@Dammit
And I've killed a chain and an XTR rear mech - I had taken the chain off the chainring at the front as otherwise you can balance against the pedals in a way that you can't when rolling, and left the chain hanging off the cassette, still threaded through the mech.
I think what must have happened is that as the bike rocked back and forth when I pulled up on the bars the cassette ratcheted round, dragging the chain up, until the chain wrapped itself very tightly around the cassette and mech, bending the chain and the mech lower cage.
Might be worth buying another jockey wheel cage? Don't know. Sad times for Mr Mech anyway.