[ What a vague, long winded non-explanation. But it's just that, isn't it? Kano could tell that Yuya's head hurt before, so he patted him on the head. With Héctor, it's just this general sense of overall wrongness, apparently, that can't be pinpointed and therefore Kano has no idea what to do. That biology book sure is useless in situations like this. ]

Haha, how frustrating! You sure are difficult, Héctor!! I don't think you'll tell me exactly what's wrong, and then I could maybe figure out how to help?