[Jim S]

ljudge is correct. This is illegal participation. Once the ball is snapped if the player continues on and then participates he has committed IP.
yu do have a mulitple foul. Since the one is 5 from the previous and the other is enforced under all-but-one it's fairly obvious which is going to be enforced on a normally.
I believe this is listed in the casebook under IP in rule 9.