Answer:
Brian is calm when he faces the wolf because he has adapted to his new environment.
Step-by-step explanation:
The excerpt shows that Brian was now confident in his new found habitat, the wild. Before, if he saw a wolf, he might have been terrified by it. Now, though, he faces the wolf calmly, restraining from killing it even though he could do that with his spear and bow.
He recognizes the wolf as part of his environment and this shows that he is now adapting to his new environment. This is supported by the statement, “He knew the wolf now, as the wolf knew him, and he nodded to it, nodded and smiled.”