Max had anticipated the presence of a few other Corrupted yetis but the fact that they promptly attacked the moment the first one dropped meant that they were working on a predisposed mechanism.
Based on current circumstances, he was forced to believe that the mechanism was now based on instinct which was why the yetis attacked the moment the first one dropped.
Their condition was similar to the first and the aura they gave off was no different.
They all wanted the same thing and that was Max's death for intruding on their grounds.
Without warning, they charged forward, making use of the terrain to quickly approach Max while also using the blizzard go their advantage as Max found it difficult to retreat quickly enough.
With no other alternative, he was forced to fight while also considering an opportunity.
What if he used his Will to push through the cold threatening to devour him whole?
It would and should effect reality to some extent, no?