TBMSvlad Cjelli What if you stop the game, and decide it's not a foul?
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See, as i suggested, you cant stop the game for that......referrals can only be made once the ball is "dead". So if the ref gives a penalty, the manager can challenge it if he doesn't believe it is, or if a goal is given but it was 2 yards offside (like the Swindon goal at the weekend).
When Kompany was sent off yesterday, it took about 5minutes before the game started again as all the players were arguing and he wouldn't leave the pitch. In that time a replay could be viewed by the 4th official to decide if the ref had a case for the red (doesn't have to be spot on, just enough to justify the card - not like the Rodwell incident against Liverpool)
What if the referee doesn't give a penalty (so the ball's not dead) and the next time the ball is dead is when the defender who committed that "foul" or "handball" has scored at the other end?
Review the replay, see that a penalty should have been awarded and the defender sent off before they scored at the other end?
That way absolute madness lies, and it'd be a completely different game.
Technology for line decisions absolutely yes (as long as it's virtually instant) - but technology to help retrospectively decide things which are subjective and depend on judging things like intent - no way!