I noticed the position rifle first thing when I looked at the picture later.
I thought about setting the deer up in our back yard and taking another picture, but decided to keep the "in the feld pic".
I had unloaded the rifle after the deer was located and confirmed dead.
As far as the rifle "getting away from him", the rifle was rested on a tri-pod; it wasn't going anywhere.
We had many practice sessions over the spring, summer, fall.
I made a dummy round that would feed into the rifle after the first shot so he could safely practice getting finger off triger & putting the safety back on.
Critique my lack of not noticing the muzzle on an unloaded rifle during a photo, but please stop there.