[Luckily Bradbury can't see the sour look on Sherlock's face, and the expression quickly changes once he's cut through the ropes. Sherlock lifts his tied hands over Bradbury's head and takes the knife between them.]

If you can move your legs, I'd check the door. Quietly. It doesn't look like there's a guard, but it's hard to tell.

[He starts to cut away at his own ropes with a deft hand, as if he's had to do this before. Many times, in fact.]