Lars heads east with the others following behind. The corridor travels about 30 feet before taking a sharp turn to the south. Ahead about 20 feet, the passage turns again, back to the east.
Suddenly from the rear, a thud! echoes through the hall. A few seconds later, there is a harsh laugh, and then the sound of booted feet against stone. It's not possible to tell how many boots, but certainly more than one pair. Fortunately, they do not seem to making haste.
Looking back the way they came, no member of the party can see anything but empty corridor.