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In Friday night's Five things we learned, brought to you by Haier, the world's No.1 appliance maker, we discover that Richmond's poor discipline could derail its flag tilt, Charlie Cameron isn't haunted by Dylan Grimes and the ARC is firing on all cylinders in the finals. 

LIONS V TIGERS Full match coverage and stats 

1. Richmond needs to fix its discipline

Just like it did in its round 11 loss to Port Adelaide, poor discipline cost Richmond. The most notable example came late in the second quarter when the Tigers conceded back-to-back 50m penalties to give up a goal to Lachie Neale. With the Tigers deep in attack late in the quarter, Marlion Pickett was pinged for a throw and then Shai Bolton gave away the first 50 for playing on. During an ensuing melee, Pickett gave Brisbane skipper Dayne Zorko an almighty shove to the Gabba turf, giving away a further 50. Neale punished the ill-discipline, bombing the set shot home from outside 50m. Oscar McInerney also kicked a goal after a 50m penalty.  Hardwick had sharply criticised his team for its discipline after the Port match and was justified in doing so again.

2. Charlie shakes the Grimes-sized monkey off his back

When the teams met twice towards the end of last season, Dylan Grimes did a number on Charlie Cameron on both occasions. The Tigers' All-Australian got inside Cameron's head, happy to engage in wrestling contests and make sure the Lion could not use his greatest weapon – speed. But this time around the Brisbane star would have his revenge. After a quiet opening term, Cameron brought the Gabba to life with an early goal in the second and then a brilliant finish from a forward stoppage set play just before the main break. The lightning small forward finished with three goals for the night and had Liam Baker moved to him in the final term.

 3. The ARC brought its finals game to the Gabba

The AFL's DrinkWise Score Review system has had its critics during its early stages but it produced the goods at a huge moment in the final quarter as the Tigers mounted their charge. Electric Richmond forward Shai Bolton swooped on a loose ball and threaded what appeared to be an impossible bouncing goal from the boundary line with Daniel Rich hot on his tail. The goal umpire signalled a major that would have cut the margin to nine points with six minutes to play, but the 'silent review' that takes place after every major spotted that the ball deviated slightly as it kissed the goalpost padding. The decision was correctly changed to a behind and the Lions' margin was pushed back out to 14 points. In hindsight, Bolton's muted reaction to one of the goals of the season suggested he knew the shot had brushed the post. 

4. The Tigers desperately missed their spearhead

When Tom Lynch failed to overcome a hamstring injury in time to play, it was always going to be a blow for the Tigers, but perhaps not even they knew how much. When the teams met earlier this season in round 10, Lynch was a menace, outplaying Harris Andrews by kicking three goals and setting up another. But with no Lynch, Andrews – who overcame his own hamstring tear to play – controlled the air and was one of the most influential players on the ground. Mabior Chol, who replaced Lynch, took just one mark among his seven disposals. Richmond won the inside 50 count 49-45 but often looked out of sorts going forward. They'll be desperate to get Lynch back for next weekend's elimination final.

5. Rayner only needs small numbers for a big impact

The No.1 draft pick has got better and better in his third season and stepped up in the big moments once again. After struggling to find a touch early on, it took a scuffle with Tigers skipper Trent Cotchin to ignite him. Moments after the altercation, Cam Rayner streamed forward to bomb a goal from 55m to give his team the lead and the home crowd a huge lift. Early in the third quarter it was lovely hands from Rayner – when he first baulked a handball and then gave it to Charlie Cameron for a goal – that got the Lions rolling again. Rayner had just five disposals for the game but a huge impact with one goal and two assists.