He hermit crouched, patiently watching Neil advance through the damp undergrowth. Strands of white hair fell over his remaining eye, and nestled among his rotten teeth, like a sword leaning against a rotting fence, was one shining, shivered tooth that gleamed in the moonlight. Neil knew that the hermit was lurking somewhere nearby; he could faintly smell the dank, moldy odor of decay that clung to the old man like a cape of spider webs.
How do we know this passage uses the third-person point of view?