Another fill, I just couldn't resist this. Especially not after one of the comments said "John is the British!MacgGyver" I died inside at that.
This is the prompt:
John was part of an elite military team in Afghanistan, trained to be silent, deadly, and uncatchable.
Now Sherlock is investigating a series of murders that bear the signature of a man John worked alongside in the war. As possibly the only person capable of catching the killer, John must do so whilst also keeping Sherlock safe, arguing with Mycroft, and keeping Scotland Yard from screwing the whole thing up.
John/Sherlock, or Lestrade, or Mycroft, or any other combination thereof, I'm not picky.
TL;DR: bamf!John has to track down a former army teammate who's killing folk.
John crouched over the body, frowning deeply. He recognized the style of killing and was silently berating himself for not realizing it earlier. He absentmindedly rubbed his shoulder. Then the deep voice of his flatmate and friend interrupted his thoughts, making him jump. "Your opinion on the body John. We don't have all day."
John didn't take Sherlock's irritability personally, he was just annoyed because Scotland Yard had waited until the sixth body to finally call Sherlock in. John sighed, stood, turned to Sherlock, and said, "You shouldn't continue this case."
Silence filled the dusty room of the warehouse they were in. Seeing as John had never told Sherlock to drop a case, it was understandable. Sherlock's icy, "What?" was followed by his intense gaze scanning John's body. Sherlock looked shocked when he couldn't read John. He scanned him again with the same result.
John turned to Lestrade and said calmly but firmly, "Get everyone off the scene and have someone bring the files of the last five to me. I expect no one to here inside the tape when I get back. I have to make a phone call."
And with that, John was off. They just caught the beginning of John sending orders into the phone. "Genny, I need you, Rover, and Flight to-"
Lestrade blinked and then said, "Did John Watson just tell me to get off my crime scene?"
"Yes detective inspector, and you will be going to the other side of the tape." Mycroft said as he stepped from the shadows.