I tend to agree with this. Outside of controlled environments, loss of the ground in the peripheral vision and trip hazards, tends to throw a wrench in the works of moving fast and shooting.
That said.
https://www.youtube.com/watch?v=14UN...uwdAEg&index=1
Who'd a thunk that I'd actually learn something useful in high school marching band. There really isn't any difference between moving and playing an instrument and shooting a gun. Around the 3:00 minute mark there's a really important piece of advise about stepping with "Equal space, over equal time, all the time". For me, the mechanics of walking and shooting and running and shooting are close to the same, just at a different cadence. When I need to move faster than my footwork, it's just time to run/sprint.