The issue is:
Woman [A] observes a killing of a woman [B] by someone hidden [C].
The gun is thrown down by C who then seems to have disappeared.
A walks up to B, picks up the discarded gun and puts another bullet into B.
B had been a pretty bad person, blackmailing both A and C, so no one mourned her death.
There were about two minutes between the two shootings.
A had been there to remonstrate with B.
Her putting of a bullet into the dead B was in the nature of “and that goes for me too”.
In the criminal law in the United States, the definition of a given offense generally includes up to three kinds of “elements”: the actus reus, or guilty conduct; the mens rea, or guilty mental state; and the attendant (sometimes “external”) circumstances.
This was in England though. Has A committed a crime and if so, which one?