This is the result of failure to adequately train with a weapon. Firing procedures should be automatic, rehearsed to the point of muscle memory. Most deer hunters don't fire their weapons, or even get them out, more than a few rounds a year. I know guys who've been hunting for over ten years with the same box of ammunition. It's okay for a new hunter to experience a learning curve, but if the mentor doesn't take proficiency seriously, it's unlikely the student ever will. I know the procedures and drills for every weapon I've ever used. I know the controls by feel, and could identify each weapon by feel. It's a scary joke when someone owns as powerful a weapon as a high-power rifle, and doesn't see it as necessary to master the basics. If the safety can be easily forgotten in the on position, it can just as easily be forgotten on off. Gun up, on target, safety off, aim, fire, cycle action, safety on, gun down.