Seth watches her with a frown, suddenly a little worried for her now. His issue is just personal, but she looks like she might actually be in trouble or something.

And then. Disappear? His frown deepens, and gets to his feet so he can talk to her at eye level. As she goes on, he kind of ends up just staring at her for a few moments. Could... Is it possible Daniel wasn't just ignoring him?

"I... Yeah, I think it might have," he answers finally, though he's not quite managing to put it together in his head yet, because suddenly he's much more focused on her distress. "Look, it's okay, I can see you, you're not gonna disappear," he reassures, even if he has no idea what's really going on. "And it doesn't sound crazy at all." Given she is in this particular building, she must surely be at least a little bit acquainted with weird stuff happening.