Barrel erect, two hands on. When entering the next alignment, stay back from any wall, leaving room to take a shot. Its not much different with a hand gun either; same technique applies.
Let a round loose. I guarantee they will let go.
The sound of a shell going into a shotgun OUGHT to clear the room regardless. An unarmed bugler has no incentive to stay.
If it doesn’t, you are probably dealing with an ARMED and determined thug, sho is now waiting for you in the dark, and who knows what door you have to come through. You are just asking to be shot.
Happily, my kid’s bedroom can be covered from mine - so I have no reason to go looking. Just wait with my .44 magnum carbine...if they come on after hearing the bullet chambered (similar to a shotgun), then I NEED to kill them.
If my kids were on the far side of the house, then I’d have to assume the risk. Still, entering a room with the barrel up would be like shouting, “Shoot me!”
A double action pistol would at least allow me to enter without warning them I’m armed. Held at the hip, it is easy to shoot (if you’ve practiced it) and hard to grab.