As the seal loosened more and more, he felt he was about to walk out of this place. The nightly howls were not cries of physical pain.
Perhaps it was a psychological effect, intended to draw attention, to lure the curious.
It afforded him something to eat and gave him a tool to vent his emotions, and there was a greater chance he would be rescued.
After being trapped here for myriad years, suppressed for far too long, he no longer knew what the outside world was like.
In the past, when he was sealed here, he could not control the mountains within hundreds of miles. Later, as the seal gradually weakened, he gained control over these mountains.
Out of his distorted heart, those who stayed overnight on the mountain were brought to a cave to accompany him in death.
He did not eat those people; rather, they died of sheer fright, falling from such high caves. If they did not die, they would become disabled.