"If your chain is jammed behind the cassette (between the cassette and spokes), don't yank it. Shift to the smallest cog, release rear-wheel tension, and "walk" the chain out while rotating the cassette backward. If it's wedged hard, remove the rear wheel and pull the chain out from the cassette side. If you've never had this happen, it's a special kind of panic."
"Here's the honest truth: most damage happens when people try to rip the chain out. Bent derailleur hangers, broken spokes, torn chain links... all from one "I'll just yank it." First: Stop Pedaling and Get Safe Pull off the road/path and flip your bike upside down or lean it against something stable. Do not force the pedals forward. If it's locked, you'll just drive the chain deeper. If your derailleur looks twisted toward the wheel, stop and go slower - that's hanger-bend territory."
"This is the method I try first because it often frees the chain without tools. Shift to the smallest rear cog (hardest gear). Release wheel tension: open the quick release or loosen the thru-axle. Pull the derailleur cage back with your hand to create slack in the chain. Rotate the cassette backward (as if you're pedaling backward) and gently "walk" the chain out with your fingers."
Sudden rear-wheel lockup can occur when the chain becomes jammed behind the cassette. Avoid yanking, which can bend derailleur hangers, break spokes, or tear chain links. First stop pedaling, get off the road, and stabilize the bike. If the derailleur appears twisted, proceed cautiously to avoid hanger damage. For most cases shift to the smallest cog, open rim brakes if needed, release wheel tension by opening the quick release or loosening the thru-axle, pull the derailleur cage back to create slack, rotate the cassette backward and gently walk the chain out. If the chain is firmly wedged, remove the rear wheel and extract the chain from the cassette side.
Read at Theoldguybicycleblog
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