She takes a plastic glove from an officer and looks at the letter and examines it. She looks at Sherlock, "Did you examine the  back of the body or say the inside of a body. Some bullets are designed to stay in the body... A bullet does the most damage when its inside the body." She informs him. "The injury inflicted by a bullet is directly related to the bullet's kinetic energy. This is a measure of the bullet's weight, velocity and gravitational trajectory. The combination of the three describe how much damage a bullet will cause.' She adds. She points to the window, "Also if there is no bullet wound then that means the shot wasn't mean to kill, but to distract Sherlock. From the looks of it there is no glass near the body which means that the glass had to be shattered before hand," She points to the house across the stream, "Our killer  shot from this area and must have used a silencer  there is no way in a place like this you didn't hear a gun shot." She states