Movement is part of the fight
A static square-range shooter and a defensive carbine shooter diverge the moment movement enters the problem. In a real defensive situation you may need to move — to cover, away from a threat, to a better position — while keeping the carbine ready. Doing this safely and effectively is a trained skill, and like everything in this track it's built slowly: dry, then walking on a square range, long before any speed.
Safety on the move comes first
Movement multiplies the safety stakes. Two rules dominate: muzzle discipline — the muzzle stays in a safe direction (typically a controlled muzzle-down or "depressed ready" position) as you move, never sweeping your own body, your legs, or anyone with you; and trigger discipline — the trigger finger is straight, off the trigger and indexed high on the receiver any time you're not in the act of firing a justified shot, and always while moving. The overwhelming majority of negligent discharges happen during movement and gun-handling with a finger that shouldn't be on the trigger. On the move, finger off, muzzle controlled — non-negotiable, and trained to reflex before any movement drill adds speed.
Footwork and the ready position
Moving with the carbine ready uses a deliberate, balanced footwork that keeps your upper body stable: a "groucho walk" or rolling heel-to-toe step with knees bent, weight low, absorbing the bounce with your legs so the rifle stays relatively steady. The carbine is held at a ready position (low/depressed ready from Carbine Fundamentals) so you can bring it up quickly but it's safe and you can see your path. You move smoothly and keep your head up and eyes scanning, not buried in the optic. Practiced, you can move at a controlled pace while staying ready to mount and shoot — and, just as important, while not muzzling yourself or losing balance.
The honest truth about shooting while moving
Here is the reality good instructors teach: shooting accurately while moving is hard, and most of the time the right answer is to either move OR shoot, not both at once. Hits while walking degrade quickly with distance and speed; the human platform in motion simply can't hold the precision a stationary position can. So the disciplined techniques are usually about minimizing the conflict: move to where you need to be and then shoot from a stable stop, or pause your movement for the moment of the shot. A brief, balanced halt to break an accurate shot, then continue, beats spraying rounds on the move. Genuine accurate shooting-while-moving is an advanced skill reserved for close targets where some precision can be traded for the value of not being stationary; it is not the default. When you do shoot moving, it's close range, slow pace, and smooth footwork. The judgment of when to move, when to be still, and when to shoot is itself the skill — often the steadiest, safest answer is to be stopped and stable for the shot.