AND it was AP who re-mounted! I'm not sure how to answer your question gingerarab, but it was indeed carnage. As I understand things, jockeys are no longer permitted to re-mount.
It must have been a beginners chase. Pretty much first time chasers and it only takes one to make a mistake to scare the others around them into making mistakes.
Alec is right, jockeys can no longer get back on. They stopped that in 2004 I think?
There was an even better race round Exeter or somewhere southern like that where Timmy Murphy's horse really didn't want to race! It was called Alleycat I think. So funny watching that one!