I thought this confusion is not supposed to be checked with VAR. Damn, it is such a mess.
http://www.skysports.com/football/news/11095/11199444/video-referees-questions-answered-ahead-of-first-trial-in-fa-cup-clash
When can video assistant referees (VAR) be used?
Only in four scenarios:
Awarding a goal
Deciding whether an offence is worthy of a direct red card
Awarding a penalty
Mistaken identity
It cannot be used for run-of-the-mill tackles anywhere outside the penalty area, for bookings or for free-kicks. Just huge, game-altering decisions.