What was going on with Big Brown post race?

Question

What was Big Brown doing post race bumping into the "escort" horse like that?

Answer 1

He's still got a lot left in him, apparently. Big Brown has had his antics before.

Edit: Also, there was a possibility that Eight Belles freaked him out. She broke down within 20 yards of him. A kind news anchor pointed this out post race.

Answer 2

He still had a lot of energy and as the other poster said, Eight Belles broke down really near hom.

RIP Fine lady. . You were great today and will be missed.

Answer 3

He was just being a young colt.  Fun and frisky.

Answer 4

I don't know... I am still upset about the other horse falling and breaking both ankles, they had to euthanise it.... horrible....poor thing....