Would it be easier to do one that retracts into the wall, or one that swings out to open so that when it opens it's held parallel to the ceiling in the hallway? It's not a narrow hall; it'd be wide enough for the height of the door.

[Sam just makes a chuffy little laugh noise, pointing to the door. Above the frame, there are several sigils; some are etched on, some appear to be black marker. In Hiro's defense they aren't conspicuous, but they are there.]

Dude, I bartered with a dragon to have a how-to---and I told you, I'm pretty sure, when you were wondering about a security system? The day I fought Bert? That I was gonna get a ward up on our digs.