How's he half fit? If he wasn't fully fit AVB would not play him. Torres was fine the next day after the concussion, he had a full training session, just couldn't remember a few things from the Spain game.
A concussion is a serious injury. If he's suffered a concussion, the slightest knock could harm him. Hence why Chicharito is out for 3/4 weeks with a concussion. The fact you've said he can't remember things from the Spain game shows just how bad the concussion was too..