Undyne's smile dropped. Of course Papyrus wouldn't tell her. He doesn't trust her anymore. The trial had proven that.

She still needs to keep her promise. Even if she needs to somehow tear through the fabric of time and space to break the barrier.

She decided to move on to her other questions, and asked, "What is this place? Why are we here?! Are any other monsters?!! Why can't I summon any spears?!!! HAVE WE REALLY BEEN TAKEN PRISIONER BY AN EVIL ALIEN RACE?!!!!"