Of course Koltira would want to know how to best defeat the goddesses. He's been aiming for that for a while now. But that's Koltira's prerogative, isn't it? Even if Papyrus quietly disapproves, he won't make a peep on that.

For now, he can focus on the good they've done.

"Thank you for believing in us! Maybe once this is all over... we can talk again, if you'd like!" She might still be grieving, but what better time to throw yourself into a completely new world with new people, right?? But helping people forget about their problems is one of his strong suits.