Well the first consideration would be the fact that he presumably went up there without test firing the weapon. The scope is essentially useless if distance and wind aren’t dialed in. In theory one could add a click or two by watching a flag to determine wind speed. Otherwise you’re just putting a red dot on what might be the target, or could just as easily be 5 up and left. This is where iron sights would be a step up. First shot misses, you adjust your aim. Relying on the scope, you adjust the wheels on the side and top to move the dot onto your target. Pointless fiddling if you’re in a hurry. If I miss the first shot and I’m in a hurry, I move the gun, not adjust the sights. No time for that nonsense. Just my opinion, but in that situation it’s better and quicker to adjust your aim as you would a handgun. Actual snipers work in teams with a spotter who watches the wing speed and direction, uses the rangefinder, and calls the adjustments to the shooter who then dials in the scope based on his partner’s observations.
More points that make it even less likely that Crooks shot those initial 2-3 bullets.