There's a fanfic titled 'In the Line of Fire'. Here, they are caught in a crossfire during a gang - related investigation. John is shot in the leg and Sherlock, while trying to drag him to safety, falls and injures his wrist. It shows how they rely on each other's medical and detective skills respectively to survive and continue the case.
One possible fanfiction could be 'The Unforeseen Danger'. In this story, Sherlock and John are on a case chasing a serial killer. While investigating an abandoned building, they are ambushed. John gets stabbed while trying to protect Sherlock, and Sherlock, in his rage to save John, gets a severe blow to the head. But their strong bond helps them get through the ordeal.
A great fanfiction in this regard is 'The Accidental Encounter'. Sherlock and John are lured into a trap by a criminal mastermind. John is poisoned first, and Sherlock, in his attempt to find the antidote, gets trapped in a collapsing room and is hit by falling debris. Their friendship and Sherlock's quick thinking are put to the test to save both of them.
Look to Chapter 229 for the clearest answer. It begins with Huo Ziyang's face had already turned deathly pale., keeps building through Huo Xuan, how did she come to know about this?!, and lands on Isn't it enough to teach a child a lesson when he makes a mistake?.
A practical answer is Chapter 268, because it turns the idea into a concrete scene. The chapter opens with To ensure the company's successful listing, Shen Lan even went so far as..., adds pressure through Having chosen to be his wife, she was determined to be responsible for his..., and ends on.
The best chapter pointer here is Chapter 266, "He Really Deserves to Die!". It opens with Upon hearing this, the deputy director's expression also turned serious. and closes on Now I see why Jiang Li despises her brother so much, utterly unreliable!"....
Look to Chapter 264 for the clearest answer. It begins with Jiang Li first reassured her mother, then opened the chat box with Shen..., keeps building through She had just sent a message when Shen Lan's video call came through., and lands on [Do your faces hurt, you rumormongers?.
A practical answer is Chapter 228, because it turns the idea into a concrete scene. The chapter opens with Huo Ziyang had not stepped out of the house for a whole week., adds pressure through She would never allow such scum in her family!, and ends on Why did you hit Ziyang?" Huo Xuan, one hand.
The best chapter pointer here is Chapter 249, "Maxing Out Wilderness Survival Skills!". It opens with Jiang Yan's body subconsciously shivered twice. and closes on He deserves it!] [It was absolutely the right decision for Jiang Li to....
The best chapter pointer here is Chapter 232, "He's a Pure Man! Purebred!". It opens with But soon, she suppressed this strange feeling and slowly began to speak,... and closes on The moment he saw the information come through, Jiang Li fell silent..
Look to Chapter 271 for the clearest answer. It begins with He had barely finished speaking when he received a withering look from..., keeps building through How did he blurt that out?!, and lands on Gathering her thoughts, Jiang Li looked toward Jiang Yan, who was still....