I just wanted to ask, did the 'draining' have to do with Baker's cysts? I'm having pain in my knee, again, at the back, and think that there is fluid perhaps bulging out. Hopeing it will get better with icing and elevation. Would that help you?
I had a 'funny' incident last year where I foolishly let a friend talk me into riding through the lower 20 acres, where the herd is loose. my horse is the dominant one, normally, but had been isolated from the herd on a dry paddock for two months. When we got in there, and the herd saw 'the king' coming in, they all came running around, and some were challenging him, and he was ready for the brawl . . . with me on top!
My friend said to just ride him forward, but he wouldn't go, or listen much to me. So, friend said, "just bail off!". I was more afraid of having my knees blown out by the sort of landing you describe than I was of being kicked or reared off. I did finally get my horse off to the side, dismount, and take charge of driving the herd off of us. I probably should have gotten smarter and braver ON the horse, but I had lost all confidence by then. It happens.