When he hears the clash of metal on rock, it does stop him running only briefly. He stops and ensures that his old friend is able to get up before continuing on.

It does open up some, but it's generally tighter, but manageable. The sound of the worm still working behind them is enough to urge them on.

The tunnels wind and weave, widening and narrowing at random until at last, there is the muted red light of the outside world up ahead.