Colorado pursues MacKenna and Inga, catching up to them at an ancient Indian dwelling high up the cliff. They fight. Colorado has Hachita's tomahawk so is the early aggressor, and would kill MacKenna but for Inga's desperate intervention. MacKenna gains the advantage over Colorado with some punishing blows, rendering him helpless. At that moment the marauding Apaches, presumably having followed the party's tracks into the mountain, enter the canyon and shoot up at the three. The Apaches thunder down to the canyon floor, shouting excitedly. However, the noise and the pounding of the horses causes a rockfall which in turn causes the valley floor to buckle and quake. The Apaches flee, and the three survivors descend the cliff and scramble for horses, barely escaping the collapse of the canyon walls, which buries the gold beyond reach. This is followed by the crash of "Shaking Rock".