In nature, attacks always begin with the weakest. That is, a predator always attacks the easiest prey. Then it attacks the more difficult, and then the most difficult. This is an unchangeable rule. The Compelling Force must have attacked the easiest, the two Yuris in the Cedar, because their stillness and obvious location made them the weakest link. Then it was the turn of the trio who went up to the tent. Finally, it was the turn of the four hiding in the snow cave. Because the four hiding in the cave were the most difficult. They were hidden in a confined space. And the attack was more difficult!!! I think this difficulty angered the Unknown Force, causing it to break their ribs, gouge out their eyes and tongue!!! So, the Unknown Force gets angrier and more aggressive as it faces more difficulty!!!