[Ghostofjoey]

You should probably buy the NFHS Case Book and look at 2.17.2 Situation E. The case book delves into the rules substantially further and makes a big difference in these sort of things. Bottom line is at every level of the game it is legal as long as it is the lineman's immediate first move and everyone from the top will tell you that.

That case is so much of the problem with the interpretation.  "Immediately"?  What is immediately?  Doing a belly flop on the snap?  Cause that is the only way it could be immediate.  If an offensive lineman takes one step, that shouldn't be immediate.  Still doesn't change the fact that when the cut blocks impact the defender the ball is clearly out of the FBZ.  Show me one on film that this  isn't the case. 

Good input though.  I actually appreciate someone that shows me a more concrete interpretation from the case book than just what the heard!