There's no question that he's telling the truth, that they need to run, because as the siren begins to sound, it looks like the world around them begins to decompose. Beth kicks up ash as she goes, running after him, staring in horror as the building beside them falls to ruin with the sort of rapidity that should be impossible. She wants to shout again, ask him what's happening, but she knows better. If they shout, they might draw attention to themselves and if this place was bad before, somehow she knows it's worse now.

She isn't paying attention to where she's running and when they sprint around a corner, she slams into a warm, solid body, hits it so hard that she stumbles back and falls in the ash, jarring her wrist painfully.

In any other situation she'd be up in a second, brandishing her knife. But in any other situation, it wouldn't be her doppelganger looming over her with her own knife. The Beth who's standing doesn't look like she's going to attack, it doesn't look like she can, not with blood flowing freely from the ragged hole in her wrist.