This possible scenario is a perfect example of "no 2 plays are alike", and the call depends, exclusively, on what is specifically observed in the particular play you're looking at.
The "hard count" itself is immaterial, and the call, if there is one, should depends on the specific action taken by the back. A "usual" movement by the back going in motion either directly sideways, or stepping forward before turning sideways is a movement the defense is responsible to react properly to.
When that back, makes an explosive or exaggerated movement with that 1st step, in either direction, that produces a violation by the defense, a judgment has to be made whether that specific action was intended to, or had the effect of inducing a defensive violation, and if so, constitutes a dead-ball false start.
What constitutes "explosive" or "exaggerated" or any other descriptive word that suggests a successful effort at creating an UNFAIR advantage/disadvantage, is up to YOU based on what you observe. It's not all that coincidental, how often that movement by a back changes, as the game progresses, in short yardage situations.