"Don't make promises if you can't keep them. That's why I never make a promise to Jack," John pointed out becuse he wasn't entirely sure the Doctor was going to save him. Sure the nose bleed had stopped but he could still taste copper, the light still hurt and clearly he was not doing too good. "Go, work, don't stand here talking to me. It's fine, I can't fall asleep, can I?" No, he just had to sit here and keep himself awake and not dead.