Go take a look.

You walk over to where Harley's stood at the edge of the building and look across the street.

"It looks like a hole" you say "A big fucking hole, I'll grant you that, but most definitely a hole"

"Jeez!" Harley says, throwing her hands to her head in exasperation "I can see it's a hole, I'm crazy not stupid but what do you SEE?"

"Well" you reply staring more intently "I can see that there used to be a building there, a restaurant if memory serves me well, but now there's just a big, fucking hole"

"GOD!" Harley yells "BUT WHAT DO YOU SEEEEEEE???"

"FINE!" you yell back at her "I SEE WHAT LOOKS LIKE A VERTICAL TEAR IN THE SPACE TIME CONTINUUM PROBABLY AS A RESULT OF THIS WHOLE PLACE COLLIDING WITH ANOTHER WORLD!"

"A vertical tear in the space time continuum?" Harley says with a raised eyebrow.

"What?" you reply "I watch Star Trek"

Harley claps her hands together laughing "Oh, I like you" she beams "So tell me Spock, what do you see inside this tear?"

You crouch down to get a better look.

"Well" you ponder "I can see what looks like Central City"

"Really?" Harley says crouching down beside you to get a better view "What makes you say that?"

"That" you say,pointing at a building you can see through the tear "It says Central City Citizen on it,I'm pretty sure that's the office of their newspaper"

"Clever boy" Harley says, patting you on the head approvingly "So, do you think it's like a doorway, we can walk through and BLAMMO we're in Central City?"

"Well, it didn't kill us when we set foot into Aero's apartment block" you offer "And I'm pretty sure it's the same principal"

"Hmmm" Harley replies standing up "But we don't know 100% if stepping through this tear will turn us inside out or not"

"So what do you suggest we do?" you ask

"Oh" she smiles at you "I have an idea"

With that she pushes you off the edge of the building.