What is revealed about White Fang through his interaction with the fire?

For a moment [White Fang] was paralysed. The unknown, lurking in the midst of the sticks and moss, was savagely clutching him by the nose. He scrambled backward, bursting out in an astonished explosion of ki-yi's. At the sound, Kiche leaped snarling to the end of her stick, and there raged terribly because she could not come to his aid. But Grey Beaver laughed loudly, and slapped his thighs, and told the happening to all the rest of the camp, till everybody was laughing uproariously. But White Fang sat on his haunches and ki-yi'd and ki-yi'd, a forlorn and pitiable little figure in the midst of the man-animals.