Here's why:
* Reflexive pronouns refer back to the subject of the sentence. They are used when the subject of the verb is also the object of the verb.
* Intensive pronouns emphasize the subject of the sentence.
Let's look at some examples:
* Reflexive: "The dog scratched itself." (The dog is both the subject and the object of the verb "scratched")
* Intensive: "The dog itself scratched the furniture." (The pronoun "itself" emphasizes that the dog was the one who scratched the furniture)
In the case of "itself," it is used to show that the subject of the sentence is performing the action upon itself. Therefore, it is a reflexive pronoun.