Yet an instinct that was more infallible than reason told him that she was near, or should be near.

He did not take accident or sickness or the possibility of hunters having killed her into consideration.

This was where he had always started in to hunt for her, and sooner or later he had found her.

He knew her smell.

And he crossed and recrossed the bottoms so that it could not escape him.
When Thor was love-sick he was more or less like a man: that is to say, he was an idiot.