"It's fine." He's not dismissive of her condolences about the war, he just doesn't really have any use for that kind of sentiment. Especially from a muggle. Even one who's been through all that-- which, while interesting, is also something he doesn't have use (or time) to sift through at the moment. "You do have a use. We need to be able to try and find out when the transmissions came through and how they were able to connect in the midst of what's otherwise been a complete blackout."

Tech things that Severus has no knowledge of. He's frustrated by his uselessness, but it can't be helped at this point. "I understand that being isolated here makes people feel anxious and helpless, but it's just a feeling."