They didn't have their sirens on or anything, but they were still chasing.

It was just a bang and then I heard sirens.

As he pushed her by the shoulder toward the gate, the rising howl commenced. Nightmares had beome a science. Someone, a mere human, had taken the time to dream up this satanic howling. And what success! It was the sound of panic itself, mounting and straining toward the extinction they all knew, individually, to be theirs. It was a sound you were obliged to take personally.

I am a siren, and for my adoration of mankind, have been caught in fishing nets one time too many. And in those fishing nets I have learned too many unfavorable things about human intentions and the lack of trust and goodwill; I'm not going to allow myself to be caught, anymore. Sirens do well at singing the sirens' song and dragging vile people to their deaths, and for good reason!

I don't know. I guess I'm tired of chasing city rats.

So we gave up. I'd finally had enough of chasing after a ghost who did not want to be seen. We'd failed, maybe, but some mysteries aren't meant to be solved.