There are multiple reasons, he muses, not to burn the place to the ground. Edwin might need a living host. There might be prisoners. He double-checks the compass lens - yes, the trace of the barge's ripples in this spacetime is emanating from inside this building, not something beyond it, or some tunnels in the mountains themselves, which is a relief. Jedao does them the courtesy of knocking, once, before he opens the lock mechanism from the inside.