A steep hill and sliding stones

This might be what you would call my sisters story, but it was so much better from my point of view....you will find out why soon.  We rode our horses through the woods, lightly skipping over branches and dry leaves.  My sister was on her lovely horse, Jamir who can be very spirited at times.  I rode my good 20 year old Desty.  Our trainer rode slightly ahead of us on his stallion.  "Lets go down this hill, it'll be a good challenge for you two." He said.  So down we went.  I was in the middle, my trainer in front, Paige in the back.  The horses were freaked, the rocks were sliding out from under their hooves, they held their heads high with ears lain back on their necks.  From behind me I hear Paige mumble something, I thought nothing of it and kept on track.  next thing you know Jamir is passing me on my right......no Paige......no saddle.  Maybe I was missing something.....she was with us, right?  The only thing visible was a leg over his shoulder and a twisted girth strap.  On the steep hills Jamir likes to prance to the side so the saddle flipped.  No one got hurt and my sister did not fall off.  I don't have much to say for myself,  I got the good horse.  And I might just have to say that Paige is a better rider than me.  Can anyone relate? -Rachel