If you want to escape a tormentor grab, just start teabagging furiously. You can escape it just like a stasis freeze. Have done this many times in onslaught and can confirm that it works.
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How consistent is it. Could be false association. Stunning a tormentor while in grab causes you to be released. That’s why they are such a nuisance solo, especially in activities where they can 1 shot ya.