Well, I know from experience that submission can be triggered and it can be automatic like a reflex. It’s disorienting when that happens, it can also feel like a betrayal, but I’m not sure who is responsible for it. It may be a betrayal from oneself. A reflex isn’t a choice, If something flies toward your face, you dodge it without thinking.
Submission is a choice, it is not submission if no choice was made. So if it was triggered or forced, that would mean that it wasn’t a choice, which means that triggered or forced kneeling doesn’t fall under the definition of submission.