Board Thread:Questions and Answers/@comment-5808186-20170801093304/@comment-31196611-20170926163058

He could of just been exploring, thats a thing some kids do right?

Besides if Chara fell before they moved onwards, then that creates a bit of an error in the Waterfall section with those lore screens. One of them says that the underground has no entrances or exists so no one can come down, but at this point Chara would of been with them so thats a contractdiction