A simile will always use either the word "like" or "as" to create a comparison. It's important not to mistake the statement for a metaphor, which is a comparison that typically uses words such as "is" to connect the two topics or objects.
Answer:
Percy realizes that the voice wants him to steal the lightening bolt. He also realizes that the voice isn't trying to pull him into the chasm, but rather pull itself out.
Explanation:
From Percy Jackson & the Olympians: The Lightning Thief