For all of those people who seem to be having an issue with the boss, it repeats the same pattern over. It'll open it's mouth and cross the upper area, and then pass back with his mouth shut (he can't consume fairies then), and it will then repeat for the lower area. So you just have to alternate accordingly.
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 "Run"){kind=icon}
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 "Greg Can Jump!"){kind=icon}
 "William and Sly"){kind=icon}
 "Music Catch 2"){kind=icon}
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