Breathing was a struggle. he felt like he couldn't push the air through his lungs. He felt like he might suffocate, but the grip of Cas' hand in his helped keep him from panicking. He closed his eyes, focused on the breathing, visualising his breath moving through his airway.
Camp. He was in the camp. Camp was real. Cas was real. Dean too, where ever he was. Sam managed a couple of breaths, and it seemed to get easier. He opened his eyes. "I can't keep doing this, Cas."