Tang Yi dislocating his thumb to get out of the cuffs, a thing he could have done at any time while they were crouching behind rocks... XD

That speech he gives about learning that trick is great, but I can't figure out when in his life he learned it. There doesn't seem to have been time while he was a homeless runaway, and is it really something that TGD would have taught him? TY's scenes with TGD (or TY before TGD dies) seem too soft for that, for me