Firslty, what 'potential' rule are you referring to? Also, one still of Trippier turning doesn't mean he instructed to wait in the oppo half. Looks more like in that photo that he is turning to celebrate with the bench.
I am referring to Law 8 and in particular these two clauses;
• all players, except the player taking the kick-off, must be in their own half
of the field of play
• a goal may be scored directly against the opponents from the kick-off
It was pretty well documented throughout the world cup, and that Trippier photo comes from an article directly referencing this (https://www.thetimes.co.uk/article/world-cup-rule-that-made-trippier-celebrate-without-his-england-team-mates-pht6wp669 or https://www.si.com/soccer/2018/06/19/world-cup-celebration-rules-player-still-pitch-prevents-quick-kick), that there was serious confusion as to the nuances of the Kick-Off Law.
Personally, and the reason I stated in the brackets that I don't think it exists, I think that the law clearly states that opponents have to be in their own half rather than not in the opposition half so players doing this is silly.
However, if you look at the footage of Murray's winner at Birmingham, Norwood's lack of celebration clearly stops Birmingham from taking a quick kick off and scoring (as our players famously ran into our own half to celebrate) so making sure that we have a player who "takes one for the team" and stands in the opposition half, preventing the game from restarting, is clearly something that is a conscious decision made by the coaching staff. Better safe than sorry.