Oh... a great lot of them, we didn't stick around very long to find out, since we'd come mostly unarmed. But they had glowing eyes, I'd say at least fifty or so.

[ Yeah, not the most helpful of information, but last time Aziraphale went toe-to-toe with a spirit he got eaten. It was in dreamscape, but still. Not something he'd like to relive, and Steve had been freaking out in his arms. Have you ever held a teenager who wanted to escape your embrace while flying, and you didn't want to drop them into a pit of crocodiles where you weren't entirely sure if they functioned like normal crocodiles which leap several feet into the air? Yes, it was sort of like that. ]

We should go back sometime, more prepared. And with batteries.