Poor Narumi's first gift is like his personal avatar... Besides having a perpetual poker face, he seems to be cursed/blessed with pretty girls literally throwing themselves at his face with their lower torsos.
When you saw someone losing consciousness after hitting their head, the first thing that should come to mind is getting him to ER/calling emergency service. How come she is so calm and only care about trying to kiss him.
Thinking about this realistically, a girl falling ass first with pretty much all of her weight on your nose would hurt like hell on earth and you would probably need a doctor right away. It would have been funny if his nose got crooked from the last time and fixed from this time at least.
You're not wrong, and also in real life if someone was unconscious for as long as Stoney was here after a head injury, they'd likely have permanent brain damage