just some guy said:http://www.cyclingnews.com/news/concussion-broken-nose-for-horner
There is no way he should ride with concussion but trying to breathing with a broken nose while climbing ........... Kloden it is with Levi as MTN Dom minus Jani and Horner
Concussions are tricky. Most that would be diagnosed as a concussion... well there's no way you want someone with that riding.
But he apparently rode the rest of the race with this (slowly). I'd have problems walking for 10 minutes with the concussions I've dealt with. Either he's tough and lucky to not lose his balance... or maybe it wasn't horrible and he can recover over night.
I doubt it though... and he'll be of little use anyway. Take him out and let him try the Vuelta if he can.