multi faerie trap

Billy held the pizza while I drew the chalk circle on the ground, back in the alley. "Harry," he said, "how is this supposed to work exactly?"
"Hang on," I said. I didn't quite complete the circle, but took the pizza box from him. I opened it, took out one piece, and put it down in the middle of the circle on a napkin. Then I dabbed a bit of blood from the corner of my mouth where the girl had slugged me onto the bottom of the piece of pizza, stepped back, and completed the circle without willing it closed.
"Pretty simple," I said. "I'll call the faerie in close to the pizza there. He'll smell it, jump on it, eat it. When he does, he'll get the bit of my blood, and it will be enough energy to close the circle around him."
"Uh-huh," Billy said, his expression skeptical. He took out a second piece and started to take a bite. "And then you beat the information out of him?"
I took the piece out of his hand, put it back in the box, and closed it. "And then I bribe the information out of him. Save the pizza."

Summer Knight Chapter 13, Page 153


And with that, the faeries let out shrill hoots of glee, tossed aside their weapons and armaments, and threw themselves upon the piece of pizza.
As soon as the little faeries started eating, the magic circle snapped closed around them with a hardly audible pop as it sprang into place. The effect was immediate. The faeries let out half a dozen piercing shrieks of alarm and buzzed into the air, smacking into the invisible wall of the circle here and there, sending out puffs of glowing dust motes when they did. They fell into a panicked spiral, around the inside of the circle, until Toot-toot landed on the ground, looked up at the other faeries, and started shouting, "Ten Huts! Ten Huts!"

Summer Knight Chapter 13, Page 156