How does it work. Can a team stop a linebreak to review a forward pass?
Only decisions that result in a loss of possession and a structured restart - ie. scrum, penalty, line drop out, 20m tap (handover?). So a team can't stop play in progress, it has to already be stopped.
Can also see this going the way it has in cricket. A team will burn the challenge on something stupid early in the half and then later, some howler will be unable to be overturned because the challenge is gone and people will scream bloody murder anyway.
That's where the first big controversy with the challenge system will arise once it's in the spotlight of the NRL. The problem is that the only penalty for a failed challenge is losing the right to challenge, which inevitably will lead to howlers still getting missed - or worse still howlers being recognised but with no way to do anything about it. Ridicule will follow. It'll be a self inflicted wound the game could easily avoid with a different penalty that doesn't cut off the right to challenge. If each failed challenge costs an interchange or two then teams can still challenge after failing but if they keep failing it's going to start having a big impact on their interchange rotation and game plan. So there's still a good incentive not to go overboard.
Except when one hasn't been used and a team is under the pump at the end of a half. Then they basically challenge anything just to get the advantage of a break in play and a chance to get some breath back.
Well if it costs them an interchange or two then they're going have to be real careful that they're not robbing Peter to pay Paul. If they use one near the end of the first half just to relieve some pressure then they might find themselves in trouble with tired forwards mid way thru the second half and not enough interchanges left to complete their rotation.
Or if they use their last interchange late in the second half on a spurious challenge then they might find themselves playing with 12 men after the next injury. I'm actually OK with those scenarios, it'll only happen at an existing break in play anyway and at worst it'll give them another 60 to 90 secs. If the team thinks that's worth more to them than using one of ten interchanges then as far as I'm concerned all's fair in love and war.
We should just adopt superleagues system. Its better
Seriously? We've just had the video refs most controversy free season ever, in no small part because the new system puts the responsibility back on the on field officials to make the 50/50 calls. The video ref only needs to handle the howlers, deferring any 50/50 decisions back to the original call. It's taken all the heat off the video ref and significantly reduced the probability of them getting lineball calls wrong. I'm not saying we're not seeing as many mistakes but fans in general seem more forgiving of mistakes made by an on field ref who has to make the decision in a split second than of mistakes made (or perceived) by a faceless man in a box after watching endless replays.
Leigh.