Just like fosters kick to the head on whitehead

With his knee as Whitehead turns. Total accident, as Foster said on Twitter he is good friends with Whitehead and toured with him for international games.

It doesn't matter if they're married.

Hopefully Foster was just carrying Whitehead's bags for him?

So during regular play, not in the act of scoring, if an attempt to dislodge the ball by Kicking instead of making a tackle was used by a saints player and he didn't quite get the ball with his foot, he is allowed to knee a player in the head?

Players get all sorts of injuries from accidental collisions made in the act of tackling unless you are suggesting he would deliberately knee somebody in the head.
Why would anyone want to apply an invented rule to saints players only?