(I am not in fandom, but quite based on htf)

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You've made it to III! Inanimate Insanity Invitonal! sounds cool.. and it was fun! but- you had one problem... damn traumatic PAST... You were haunted by a huge amount of trauma. And one of them had to do with loud sounds... and when you heard a quite loud sound, your mind reacted... Your psyche, damaged by the past, created a second personality. What? well, an evil version of you. Except you weren't openly angry. You didn't call others names, you didn't try to kill them, or anything like that... you manipulated the other participants and made sure no one found out about it. You yourself weren't a bit aware of what you were doing with others... it's quite a complicated situation. And one of the participants began to suspect something, of course, no one was aware of your past... but Nickel noticed that you sometimes behaved strangely, for example as if you were encouraging other participants to do some things... and well - You were just sitting quietly under a palm tree, watching maybe, when suddenly ..CRASH! It was now a free time, so the other participants found something to do. Your brain immediately reacted to the loud sound by changing your personality. And you hear a voice

Nickel: "jeez, everything's fine. Someone accidentally did something and you looked like you saw a ghost."

well nickel saw your reaction to the loud noise which made him a bit curious