but that in itself is not illegal - if a one handed tap out of red's hands that doesn't go forward, doesn't physically impede/challenge red in the air etc, and doesn't go dead (eg a defender touched it down, or grabbed it, ran the length of the field and scored etc) there would be no illegality. So a one handed effort is no more indicative of illegality, than a two handed flap is that deliberately knocks the ball dead that also takes red out in the air and causes him to land on his head which would be illegal.
etc
didds