[Undyne has so many Feelings that she's about to chew Sans out even more, but luckily Papyrus comes to defuse the situation. She can't stay mad when Papyrus is here, so she just deflates, leaning into the hug while trying to pretend she's totally not.]

I'm not worrying! And don't just say you're sorry - if you're really sorry, then prove it and stop putting yourself in danger when we're not around all the time! Even if we can't share rooms anymore, at least...

[She trails off, finally noticing that the lobby's a lot more empty than it had been before and that a certain someone is missing.]

...where's Clover?