Severus just shakes his head slightly. Of course he doesn't mind, he offered. And he understands - viscerally. Though he'd been a child at the time and had not expected anything. Darcy at least ran. Severus had frozen in terror and stared, unable to function at all.

"You're just two up," he says, not really a question but more of a confirmation that's where she's headed; some people move. Severus hasn't bothered (even if he has taken over a few neighboring spaces as storage and workspace). He steps around her to palm the door open. Instinctively he walks a little ahead for a bit, because he thinks she might be jumpy still.