not sure if you've ever rolled with high-level grapplers, but think of it like this (keep in mind, I didn't see the actual fight last night, just read the play-by-play). Fighters are trained to keep going for the sub until the ref stops them - there are plenty of examples of fighters who thought the opponent tapped when they didn't, and let go. So in that case, if a fighter is yanking on a limb of yours, and you can feel it start to pop/break, your gut reaction is to relieve some pressure any way you can, often with whatever free arm you have. Now if one arm is trapped in a sub, the other is trying support it so it doesn't break, how else do you tap? Thus, the verbal tapout.
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