Well, I've already pinged them to this thread once, let's see, before pinging them again, if anyone chimes in that they've either got a link to footage or can report this :~D
I remember watching on TV when the great filly, Ruffian, broke her leg. Before I even noticed anything amiss, Dad hollered out, "She's pulling up lame". His eyes for horses were thoses of a true natural horseman. I know that he didn't watch the Preakness this year or I'd ask him. I remember watching Ruffian fretting and looking towards the retreating back side of her rival. The competitiveness in her not wanting to accept seeing another horse in the lead. She was a great one!