 Why does Groz not want to go into the mountain?
From the other direction, the long way that they two had come, it was not difficult to sense the thought of Groz. It was black night, as it would really be when Groz and his henchmen reached this place; lurid fire spewed from the Ryzga mountain, and strange lights dipped above it; and for good measure there was an avalanche in the dream, and hideous beasts rushed snapping and ravening from the crevices of the rock. And before very long, I'm sure, I would have performed some deed which Groz would recognize as a worthy exploit, and would thus have healed the feud between our families. I have only one idea left: we can go where Groz may fear to follow us."
 He is nervous about the technology left behind
 He does not want to get separated from his team  He is scared of the wildlife that might try to attack  He is nervous about the technology left behind  He knows it will be hard to see the people he is chasing