try
www.nbcsports.com
I have the entire NBC show on tape and also I may have the Churchill feed as well.
On the pan shot HS appears to bobble or clip heels but after watching the overhead shot again yesterday, I'm convinced that HS ran into SS's tail. I ride horses and have been smacked by swishing tails (insert your own joke here) and it stings. Certainly HS would snap his head back after running into a rival's tail.