I believe the BR's would have followed Frodo and the ring and left the rest of them alone. But still...I was forgetting that they would be needed to deal with the Riders left on the wrong side of the Ford. [what do you need with a Ford when you've got a horse? Hehehehe]
I'd have thought horses could outpace men any day, after all, they have four feet and longer legs and are big. And you always hear about how weak men are physically compared to other animals.
What did you think about the movie version of Rivendell?