Oh, she's... not going to be wanting to talk much, probably.

During the very beginning of the call, Mary was mentioned as the other person stuck in the library for the night. The lady he's gone sweet on (to say it as gently as possible), Magne, is happy to know he's safe. She doesn't have to worry about him getting holed up someplace randomly and unable to get back tonight. The conversation isn't long, but it's clear they're on quite friendly terms. (César, it's impossible for you to stop being a wife guy, huh?)

César watches her for a moment, unsure. He wants to make sure she's all right before he goes off to the science section.