The difference between Sherlock’s face and John’s face: this is not the first time John has seen this happen to a man.
Greg, too. Look at his face. If he’s about 50, then he’s probably been on the force for more than 20 years. 7/7, the 1990s IRA campaign…yeah.
Always thought it was a bit pretentious to say that Sherlock’s London was the battlefield. It’s Lestrade’s London that has the riots and terrorist attacks. Sherlock doesn’t care about those. Not cerebral enough for him.
John and Greg are inured to it. Sherlock, on the other hand, is somewhere between horrified and fascinated, because he’s Sherlock and exploding humans would fascinate him.