People often express their true feelings when they hide behind some kind of mask or due to feeling anonymity - where they hide their very selves behind a disguise. They hide behind their mask, and it makes them feel like they are a completely different person; separating themselves from the consequences caused by their other self.
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Lyn looked over at Rhys who was running ahead of her; earlier she didn't expect that. He looked at her so seriously after she showed him her powers. Though she intended to show him everything like he asked her, for some reason he stopped her halfway. She doesn't understand this person at all. From what she saw earlier it's clear that he's the type who fools around a lot.