Let's surmise that they had taken adequate precautions. I know on my property which way is the safest way to shoot and I also know where my neighbors are. They may have had a big box of sand to shoot into. We don't know because the details are lacking.
True. They could’ve had a perfectly correct setup with no fear of bullets leaving the property.
I have long dreamed of having a range in the house...at least for pistol practice.