shift, false start or nothing

[l3will]

I agree with mcrowder. I too am not saying that all movement is okay.

Sloth does not indicate whether the white hat would have called illegal motion or an illegal shift on this particular play.
Taking away a chance for B to drop A for a loss, intercept, recover a fumble or even foul to get in a double foul situation is why everything is a false start is not a good thing.

If an A back fires and B reacts, kill it... false start.

This should all be worked out in the crew to get some type of consistency.