[Of course he's worried. Hope is hard to find when the odds seem against you, and she knows the whole city must know by now that they're on the brink of it. Their time is up. It's now or never.

Alphys doesn't know if she's feeling hopeful right now. Most of it just feels like fear.]

I uhm, I, I d-don't want to keep you, but I needed to ask you, uh...

[She runs one hand over the other, palm to back, claws curled inwards.]

When the Null come, uh. If we're fighting them, and something happens, uh, y-you know, you'll bring us back, right? Because we're on your side?

[Maybe she can phrase it like this. [Name] is one of their own, as far as she's concerned. She just needs to make it convincing.]