It really depends on how they define staging. Both free kicks were there imo. You see stringer with his hand in grimes back push off and you see Bellchambers flinging arm connect with vlastuin high.
In vlastuin case I don’t think it’s an unnatural reaction to fling your head back when a 100kg object connects with you moving in the opposite direction.
In grimes case while it looked like a fair bit of mayo on there I don’t know how you can prove it one way or the other.