The range[s] in this area encourage poking holes in paper from a static position. No drawing from holster. No side stepping. You will shoot from one of the standard positions or not at all. That being said, the guy "practicing" in a deserted building has no rules to follow.
A few years ago, our local police dept. had an active shooter come out of the house onto his front porch. The cops shot many dozens of rounds at the guy. All missed! Practice doesn't make perfect.
One of my pet peeves is the use of the term "assault rifle". If folks would take the minute it takes to look it up they would fine that an assault rifle has a selector switch. People refer to any military looking rifle as an "assault rifle". A semi-auto is just that no matter what kind of furniture it has.