[AlexW]

"I wonder how often this happens?"

As a 15 year staff member of a large fox hunt club, I crashed
over jumps plenty of times. As a rule, it is not so serious, but if the horse lands on you it is a different story.
With as many as 25 or more riders in the field, I do not recall an accident that required emergency service.

I do remember a horse falling on a girl in a horse show, and it was fatal.

[RexBeach]

Thanks for your note.

You must be one tough customer!

I'll stick to golf. If my five-iron falls on me, I won't worry. :)