[FMadera]

Assuming the attack was not caught, thrown, or had prolonged contact, you wouldn't have an illegal hit by rule, which leaves... ��

Also remember that you don't have an illegal attack (ever) until the attack is completed, so if the above example resulted in the ball not going over the net and not being contacted by the block, you wouldn't have an illegal attack by rule either. Your question hopefully assumes completion of said attack.