In season 4, episode 1, Mary Watson
jumps in front of a bullet after the bullet has been fired at Sherlock at close range.
I'm aware the dodging bullets or jumping into the line of fire after a weapon has been fired are common TV tropes.
However, I am surprised that a show such as Sherlock, which is aimed at a scientifically minded audience, would risk breaking immersion by doing something so obviously physically impossible.
Thus, I am wondering whether I missed something and there actually is an in-universe explanation for this. Is Mary not only a skilled agent but does she have supernatural powers? Or is the scene of the bullet flying towards a stunned Sherlock only playing out in Mary's mind as she anticipates the gun being fired, and she actually jumps before Norbury pulls the trigger? Or something else, some out-of-universe explanation that helps make sense of this scene?