I don't even know if night exists on the Skyway, but if it does, then the monsters lurking out there are probably not nearly as friendly as they are during the day.

[Friendly used in a sarcastic way, of course.]

Even if this person isn't up to something, it's possible that they're risking their life in a big way, and at the very least, they should be stopped for their own well being. And even then - who would risk themselves like that unless they were up to something?