TG, I think he may have been wearing your cravat during the run and it might have gotten tangled, holding his head up, not allowing him to roll properly. I think. As far as the footage goes look for it in the upcoming Rocky Mountain state series LVM. It was huge in there. I think some raft guides may have swam on that same section as well. Look to the post about the lost guide stick.
Cub boater: "What do the spiders mean?" Old fart boater: "Trust your intuition." CRCII