My Sambo coach teaches leg locks (including heel hooks both regular and inverted) to kids all the time and he's never had one injury in the gym. There's also a thread discussion on this too (Riley and BRuce are in the chain too).
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At the end of the day at some point we all need to be ready for it. I'm nervous about leg locks myself when I compete but that makes me tap all the sooner once I see it's 88% locked in or about to. As much as I like the idea of winning the sword saying I beat a high belt, I like having my limbs too.
Overall I think Sophie might have either underestimated the lock Riley had, or she over estimated her flexibility and pain tolerance. You can see her try to reach and break the lock for a full second or two before RIley makes the face of "ummm are u sure you're ok" and then I think she verbally concedes there and then you can see her leg go limp. I met Riley and her Dad at HQ in Aug and I know she's not Rousimar Palhares and she felt bummed about it too after.
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