He grinned and, taking John's hand, led him through the corridors to the room he'd found the body in.
He paused with his hand on the door handle. John wasn't squeamish, but this body was unlike anything Sherlock had seen before. "It's... Particularly gruesome," he said, before he opened the door.
Ah. Yes. It was still here. Face down on the floor, with the top of the head sliced clean off. And the brain was missing. Sherlock had been here already, had a look at the blood on the wall and the floor, but needed some equipment - and John - to start investigating properly.