Ball rebounding from wicket-keepers person (a) If the wicket is put down by the ball, it shall be regarded as having been put down by the wicket-keeper if the ball (i) rebounds on to the stumps from any part of his person or equipment, other than a protective helmet or (ii) has been kicked or thrown on to the stumps by the wicket-keeper. (b) If the ball touches a helmet worn by the wicket-keeper,