As Detlef persists, Lance simply shakes his head. He doesn't want to hear it: in fact, the more he hears, the more of a liability they both are, and now is not the time.
He guides Detlef to the cell and opens the door, but lets the stablehand go in of his own accord, and when he closes it again, he doesn't lock it: it's for appearances, and there's no harm in Detlef leaving, as long as he doesn't make another scene.

As the Shepherd's voice picks up in fervor outside, Lance's eyes go distant, and he listens.