Was he a vampire?
Besides the fact that he could not be out in the sun, in the very beginning when they are at the Dr's office the Dr asks the Mother about the 'canines'then at the school, the boys open his mouth to reveal his teeth and say "he is a vampire" or something like that..
Also, why was the wild girl protecting him? Could it be because she knew he was a monster?
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I don't know, I could be wrong, I often am.