Think it means he's really just a child trying to look tough or something. As for the meaning behind the left and right I have no idea. Maybe it's something like how his adult mind learned how to use his right side with logic but his left side isn't dominant and can now be used for his newfound "sixth sense".
Comment by AguaDeFruita on ur mom
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@AguaDeFruita the right side of the mind is for logical thinking while the left side is the creative one