"Too early to tell," Hank tries to be reassuring. "The best medications in the world aren't 100% effective. This may just be a one-off."

But the length of the seizure, the fact that an increased dose of medication had been required to bring Charles out of it, doesn't leave him feeling confident.

On the bed, Charles starts to show the first signs of coming to, forehead drawn in a frown and fingers twisting in the bedsheets.