At the beginning of the selection, when the narrator sees that Bo-Bo's pupils are dilated (enlarged), he realizes that

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The pupils can be dilated in several possible ways, one of these ways must be associated with the situation that caused Bo-Bo to dilate his pupils. The pupils can dilate in a dark environment, when someone is in intense concentration, when they are in a frightening and dangerous situation, when they feel pain, when they are surprised, when they are in a situation of great excitement or when they see a surprising situation.

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