I think it was James Robinson and Comanche. I didn't see him throw his whip as I was chatting but I did see him fall off. My friends who were also watching said he threw his whip at the horse. Obviously very frustrated, I saw him fall off in the water at Badminton too, then Comanche wouldn't be caught and went for a little swim in Badminton lake!
I Must admit that my horse once made me so cross that when I came out of the ring I jumped off gave him to my friend to hold and went for a little frustrated walk.
My foot was aching for days afterwards but then I obviously kicked the wrong bit of trailer.