Vampire CPR

Ash could feel the blood flowing in and out of Ruby's heart and throughout the rest of her body. He even checked her heartbeat with his ear and it was beating again slightly but she still wasn't breathing. Why wasn't she breathing?

"If I may, sir," Sirius spoke up hesitantly. "It looks like you're doing some sort of vampire CPR. Restarting the heart is only part of it; she needs air in her lungs as well. You need to tilt her head back, pinch her nose shut, and breathe into her mouth for her. Then keep doing whatever it was you were doing and repeat until she wakes up."

He had absolutely no idea what the werewolf was talking about but he seemed to know what he was doing. Sirius did have more experience with various fae constitutions than he did so he decided to trust him with Ruby's life.

"Two breaths then thirty compressions…or I guess a minute or so of whatever it is you were doing," he instructed seriously.