When you say "Slide was back", do you mean that slide was to the rear and chamber open, or the slide was back to chamber closed position. Please remind me if there is an exposed slide release (maybe the thumb was on slide release).
Also, there is an intro section you may want to put some input on.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)