Her arm goes flat on his windpipe and he feels the air blocked from his throat again. She's not a large person, but she's strong and determined, and he can feel that he's not going to be able to just throw her off of him with any measure of success. He thrashes, reaching up a hand to try to smack at her face.

This is bad. This is very bad. Crowley has been discorporated before, but that was back on Earth, that was back when he knew he just had to fill in some paperwork and he'd be back. This is different. He doesn't want to just die---and more importantly, he doesn't want to just lose to this girl.

He rolls his eyes back and concentrates. Focuses on making himself long and thin. If he can transform himself into the serpent, he might be able to literally slither out of her grasp before she can choke him to death.