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Soup sandwich of a bike. Wrong pads for the rotor or wrong type rotor for the pads, filthy cassette, RD shows signs of impact to the knuckle prior to this incident.
IMO the RD pushed the chain into the spokes first, probably from a bent hanger (to whatever degree), limit screws not properly set (especially if a wheel change was done), and then the knuckle failed.
If the knuckle failed first the RD would collapse down the cassette to the smallest cog, and actually probably jump off and jam between frame/cassette.
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