Apparently this was part of a competition where polo riders and jumper riders switch mounts.
I can’t believe that anyone would let their jumper be abused in quite this way — the horse deserves a medal for continuing to jump. However, I have never seen anyone get so much air over a jump and still (more or less) land in the saddle. So I guess it’s a toss up which one of them was in more pain (even though his was self inflicted).
If this man hasn’t already had children, he may well be out of luck.