"Point. The worst part is the lingering concussion effects." He did have a bit of a cough too, but that bothered him less than being able to think properly. That was just annoying.

"It's fine, it just takes time to recover, as I understand it." He probably should've been in bed but it just wasn't his style. At least he was sitting down?

That was Kaiba's first mistake - Senku hadn't gone to the healers for a second opinion, so much easier not to be berated that way.