Which phrase from paragraph 3 best demonstrates that the man does not seriously consider the potential dangers of nature

But all this—the distant trail, no sun in the sky, the great cold,
and the strangeness of it all—had no effect on the man. It was not
because he was long familiar with it. He was a newcomer in the land, and
this was his first winter.
The trouble with him was that he was not able to imagine.