The sun is as blinding as the sound of the city streets disorientating. And for a second there Splinter finds himself with an overpowering need to get underground. With his heart racing, he ducks down a nearby ally to get a handle on himself, to push his way through the panic.

That's when the sound of the sirens reaches his ears.
It's not that sirens in and of themselves are foreign to him, he's lived most of his life under New York City, they're a minute-to-minute occurrence. No the problem here is that they're getting closer. And that they're stopping near a shopping center.

A shopping center close to the spot where the door brought him in.

"...ut oh."