"A training exer- What the HELL, Sherlock?!" John continues twisting until he feels the weight of Sherlock off of him. But he doesn't even have a moment to celebrate or try to get the upper hand before he finds his airway really being restricted and his head being pulled back. It's an awkward angle, and he's feeling it in his back. Of course Sherlock would be the one to know how to do this to him. Why wouldn't he?

"Sherlock... Sherlock-- I can't breathe!" he croaks out just before Sherlock's arm loosens around his neck. But then... oh but then, he hears the rumble of Sherlock's voice against his ear, and it shoots a chilling bolt straight through him, strong enough to make him shudder and whine. He's lost his head, but only for a moment before he's trying to pry his arm off from around his neck. That bastard. Now he really can't force himself to quit. He could win this... he really could! Even with how weak Sherlock's voice and the restricted air to his brain was making him.

"I'm... I'm not--!!"