When I see someone else jump or fall from a height, I sense the fall in the bottoms of my feet and my lower legs. I feel both the drop and the landing. It also happens if I approach a ledge or dropoff.

I thought this was universal. It's pretty easy to trigger for me, even quite abstract geometric shapes that look a bit like something falling from a height can trigger it.

Lovely! I mean odd… I will look into it, thanks!