IG is of the IFP family. IFP is considered a running play with the enforcement being spot of foul. The problem of making IFP a loose ball play is if a forward pitch was made after a 40+ yard gain, and dropped, it would be treated as an incomplete pass with previous spot enforcement. Sure, we could make an exception that IG in the EZ = previous spot exception. We don't like exceptions. A safety is not a bad result for B, 2 points & recieving a free kick.