Sherlock sat very still thinking hard. John shifted his weight uncomfortably, waiting for something to happen. He watched Sherlock stare at the wall in front of him, completely free of time. It was at that very moment which John decided to break the very long silence
"Sherlock," he said slowly. Sherlock didn't appear to hear him. John assumed he was listening "you have been sitting here for hours, don't you think you need a break from all this?" Sherlock closed his eyes, letting John's words sink in. His reply was almost robotic, his voice on auto-reply whilst thinking some more
"What good will taking a break do, apart from letting more people going missing?" Sherlock remained on the case. John tried again
"I think you need help on this" Sherlock's eyes opened lazily before slowly turning his head enough to be face his flatmate
" And since when did you know me to ask for help?" he demanded, keeping eye contact with John without blinking. John continued to stare at Sherlock as if he was missing the bleeding obvious (which he probably was). Sherlock took this as a way of saying I know you're right, but I just can't be bothered to admit it. Sherlock rolled his eyes out of habit when his quick deduction of John's posture clearly stated otherwise.
" If I can't help you, then someone above your abilities should know. What would make you consider the other possibilities that you classify as "irrelevant"?" Sherlock frowned as an answer immediately came to mind, but was is the right answer? He tilted his head to the side, thinking about John's question for an eighth of a second longer before deciding that it was important. A smile touched his face for a brief second before he looked back at John
"The right sort of Doctor"