Geh- do you really think I'd climb all the way up here to tell a joke?!

[Well, actually he would. But now isn't the time for that!! Tenka's expression falls flat for a brief moment, unusually serious. It actually helps to note now that he isn't exactly looking at Sousei, and is blankly fixing his gaze a bit away from him.]

If you continue to persist, I'll just prove it to you. But I'm telling you now, all I see is murky darkness.