It felt like an eternity as he was doing the same thing again and again, like digging sand from the bottom of an hourglass and putting it back on top.
Apparently the Lord Skull Face, the boss, after making a massive amount of Skull Faces appear, withdrew to the center of the Wraith Plains. The plains were dozens of kemels from one end to another. Shin was at the edge of the plains, so no appearance of the Lord came into his range of view.