(Interested and curious and almost cold yet reserved) Fascinating. This timeline is...strange.

(A bit crazy, cold, yet fascinated) Ah. Yes. I've been watching you, Frisk. Your DETERMINATION exceeds most.

(Mocking, a bit cold before no longer mocking and sounding a bit aggressive) "Why can't I teleport", right? You're stuck in here with me.

(Whatever emotion you see fit) Ah..so you remember what I'm capable of.

(GIving up yet sad) I just want to come back...

(Angry and determined) I'LL USE ANY MEANS NECESSARY!

(Surprised and can't believe your eyes) Impossible...how did he?

(Happy and relieved and gonna pun) Heya. Did you 'mist' Me? 

(Whatever emotion you see fit) O-Oh! Don't worry little Human. I have no intention to harm you.

(A bit apathetic yet determined and then angry and determined) You're the first of your kind. I'll make sure you're the last.

(Whatever emotion you see fit) I believe I am aware of what you came to tell me.

*Gasp*

(Angry and determined) DUELITY.

(Whichever emotion you think fits) Dark, darker, yet darker.