For the definition of “impression,” please see dictionary.com.
As to the bullet, he speculates it exploded in her chest. It killed her in one minute. Close range, no exit wound. Impossible, no. Unusual? YMMV.
The heart is a very fragile organ......Many deer have been dropped dead on the spot by a shot to their heart........the deer heart is also located in the chest cavity.
No need for snarkyness.
It's hard to respond to something which is based on your "impression" of something.
Not at all. Had a shot man in my business office once (I did not shoot him). The bullet never left his body. Very common with small handgun rounds. Its usually better for the shooting victim if the bullet leaves the body. If it stayed in the body it usually does more internal damage with more internal bleeding. She was bleeding very bad internally and externally.