Sir laughed. "You see any guard towers?" "No."
"How about an electric fence?"
"No, Mr. Sir."
"There's no fence at all, is there?"
"No, Mr. Sir."
"You want to run away?" Mr. Sir asked him.
Stanley looked back at him, unsure what he meant.
"If you want to run away, go ahead, start running. I'm not going to stop you.

themselves

an intensive pronoun is a pronoun that ends in self or selves, such as himself, herself, themselves, yourself, ourselves. since band members is a third person plural, the correct intensive pronoun would be themselves. if the band was talked about as a collective noun, itself would be the appropriate intensive pronoun. intensive pronouns are used to add emphasis to the noun it's modifying which is why it directly follows it.

thunder! imagine dragons