Why do I rock/sway when people pass me meditating outdoors, and stop when they're gone?

When I meditate outside/outdoors, when my body becomes super relaxed, I notice my upper body starts to rock/sway forwards and backwards whenever anyone passes by, or when I am being observed from a distance. Sometimes, the rocking is fast, sometimes it is slow. Sometimes it is very soft and barely perceptible, sometimes it feels like one of those bobbers on the counter of a Chinese restaurant. It stops when the person/people go past, or observations stop. It also stops if I telephatically make a request for it to stop. And restarts if I ask it to continue (while the people are still walking by). Does anyone have any idea of what/why is happening? - {Edit for people who get triggered on the 'why' above in my former question: Has anyone else experienced anything like this, or know what is happening}? (Note: When I'm deep in trance, I do not consciously observe anything or anyone - my mind is still -, yet I'm aware of everyone and everything around me, almost like I'm everywhere at once. The only thing I examine, if I get so inclined, is myself).