Fourth Possibility
"Might as well come out," says Angel, "I know you're there."
Batman hesitates, then steps into the light. Most people seeing him are scared; Angel looks mildly surprised.
"What brings you to LA?"
"Don't you know?"
"You first."
"I think the Joker's using subliminal signals to hurt children."
"That's kinda why I'm here, but I don't think it's the Joker."
"What then? A foreign power? Aliens?"
"My guess is it's demons."
"Demons?"
"I'm pretty sure. Some kinda evil magic anyway. Somewhere in that direction." He heads towards a door.
Batman shrugs and follows him into a blast of blinding light.