You didn’t have time to react when Sherlock came at you, babbling about “the light” and “the chosen one”.

He had taken you by the shoulders, his irises had gone a pale white, almost as if he was possessed by something… he had shaken you roughly, and being much stronger than you, was easily able to shove you down onto the floor, causing you to hit your head against the brick wall. You presume that he came to eventually, because his eyes were blue again, and he was kneeling next to you.