Willow tilts her head, listening carefully for a moment. She can hear the grinding machinery, the occasional hiss of the steam-powered engines, and... something banging? Or running? She's not entirely sure.

She starts up the stairs cautiously, and stops after a couple steps to sniff the air. Blood. Blood of all kinds, and oil, and terror, and death. She casts a worried look back at Stiles, and she can't help worry about what they're about to face, and how he will handle it. There's really not another choice, though. She lets out a soft, rumbling growl, the only way she can think of to let him know there's danger ahead and slowly starts the climb.