[Jim S]

Almost Ed. Players can encroach until the snapper puts his hand(s) on the ball as long as they do not touch the ball, an opponent, or are there giving defensive signals. (anybody actually ever called this last one?)

Just for the rules. Shouldn't ever happen of course.
Play: Previous play has ended. RFP is blown while B42 is still in the backfield of A where he remains. A steps up to the line, center adjusts the ball and snaps the ball legally. Is there a foul? And, if so, what is the foul? And when does it take place?