1. Treloar vs the Giants
It wasn't a pleasant start for the former GWS midfielder, with Stephen Coniglio and Shane Mumford certainly making sure that Treloar knew he wasn't welcome at Spotless Stadium during the opening term. Treloar had just four touches in the first quarter as the Giants piled on seven goals to three, but he certainly had the last laugh. The man who was runner-up in last year's best and fairest at GWS finished the day with 27 possessions, six clearances and five tackles, as the Magpies pulled off a massive upset. Another former Giant Taylor Adams also torched the home side and was one of the best players on the ground with 31 disposals, 10 clearances and a goal.

Full match coverage and stats 

2. Macaffer puts the shackles on Shaw
Collingwood coach Nathan Buckley didn't need to be reminded how damaging his old teammate and GWS defender Heath Shaw can be, so he sent his recalled stopper Brent Macaffer forward to mind the star Giant. The pair of 2010 premiership Pies had a great battle for most of the match, and while Macaffer didn't find much of the footy with just six possessions, he managed a second-quarter goal when the Pies turned the game in their favour, and limited Shaw's offensive output to 20 touches. With Nathan Wilson out injured and Shaw's influence limited, the Giants struggled to get any run from defence, usually one of their biggest weapons. Buckley's move was a masterstroke. 

3. Cloke watch
The much-maligned Magpie has had a nightmare year to date, but showed he still has something to offer at senior level against GWS. Cloke took 12 marks including five contested, had 20 possessions and booted four goals for the winners matched against Adam Tomlinson for most of the day. There was a slight 'Clokey' moment in the form of a shocking miss from point-blank range in the third quarter, but overall it was an encouraging sign for his future at the highest level. The Pies might have already stamped his papers, but the display could attract some interest from other clubs around the competition. 

SHOWREEL: Collingwood's colossal forwards find form

4. What happened to the Giants?
It's hard to work out how a side that kicked seven goals in the first quarter and dominated all the major statistics, can lose a game by 32 points. The Giants won the clearances (14-5) and the contested possessions (46-38) in the first term, but lost both counts heavily after that point, with the Pies up 42-33 in clearances and 159-146 in contested ball at the final siren. Collingwood kicked the last six goals in the second quarter and nine in total for the term, and added two more after the main break for eight in a row, while GWS failed to fire a shot. It was a damning performance by Leon Cameron's men, who blew the chance to go to second on the ladder and consolidate their extremely valuable top four spot. 

5. Grundy eclipses Mummy
Not many ruckmen take on Shane Mumford and walk away with the points, but Brodie Grundy not only beat the star Giant, he was best on ground in his side's best win of the year. The big man gave away size and strength to Mumford but after finding the going tough early on, Grundy was a major reason behind Collingwood's stunning turnaround. The 22-year-old had 26 possessions, 28 hitouts, six clearances, and added a goal in the third term. Mumford was still one of the Giants' best and battled hard all day, but Grundy's performance was outstanding against one of the game's best ruckman.