Anyway, the point is that it's really not a difficult shot at all, and only requires very rudimentary training that is readily available to anyone who can make a few trips to the range.
At say 3000fps velocity, time to target is less than 450ms.
This is almost point and shoot. It’s entirely possible someone fairly untrained just aimed at the forehead and ended up with neck
I've killed deer beyond 200 yards sitting on a stump with a cheap rifle, it's not actually that hard if you've shot a bit before. The nerves though... you're right there, I couldn't imagine.