That is indeed something 'impossible', someone being alive after dying. Or well, it would if Frisk themselves hadn't done that before many times. It is a little unsettling but sometimes you gotta do what you gotta do.

The 'make everyone stop repeating' bit is not something Frisk is going to address, however.

But they still smile. "I just need a hint." A hint on how to go about making sure everyone is able to go free, the best path possible. From there on they could work things out, keep trying until it happened. They're Determined to see it through.

"If that's okay." But if she's busy, it's fine. They'll go find the Ringmaster.