Batman changes out of his Batsuit into normal clothing. He drives to Derry. He arrives at Bill's house.
"You're Bruce Wayne!"
"Hello Mr. Denbrough."
"Please just Billy. Come on in."
Bruce enters Billy's house.
"May I get you a drink?"
"Yes please."
Billy goes to the kitchen and pours lemonade.
"So what are you doing here in Derry, Mr. Wayne?"
"I actually need your help. I am trying to help the GCPD catch a mysterious killer.
"What is this killer like?"
"He can take on the form of your worst fear and preys on children."
As soon as Bruce has said this, Billy puts his cup down. He walks over to a picture of Georgie.
"What makes you think I would know anything?"
"I read your article about the killer clown. You had an encounter with IT didn't you?"
Billy nods his head. He hands Bruce a glass of lemonade.
"It was a long, long time ago. We were just kids back then. The creature killed my brother Georgie."
"I am sorry Bill."
"How did you defeat it?"
"We worked together."
"What is IT?"
"It's kind of hard to explain."
Bruce gets up and gets ready to leave.
"Well thanks for your time."
"My pleasure. Have a nice day Mr. Wayne."
"Same to you."
Bruce gets into his car and leaves Derry.