How annoying is that? Can't lock John out-- with his wriststrap, he can bypass any of the Hub's security systems besides good old-fashioned locks, and even then, Jack wouldn't put it past John to bust through those. He makes an irritated sound and then turns to look at the cog door.
... What?
Now that really can't be possible. John can travel about, sure, but... He stares, horrified-- did he pull another timeline's Toshiko out of place? Cross universes? Is this some kind of twisted joke and so much for trying to be better? "What have you done?"