Mackey showed what many - including Flames GM Brad Treliving - had praised him for as a youngster in college: Excellent hands with a superb first pass, and a smooth, yet tactical stride that moves both rubber and man with a fair bit of ease.
All of it was display as he put the Flames up 6-2 over the Canucks in that notable, late-May finale.
"I remember the winger coming down, and I had a pretty good gap on him if he cut back," Mackey said. "But there was a pass through the middle and Derek Ryan picked it off.
"I knew right away.
"He started skating with it and I thought, 'I'm going to beat this winger off the wall.' I did, and it turned into a mini 3-on-2 after (Ryan) kicked it out wide. I was going to the net with the stick on the ice - the simple little details that you learn growing up. I stopped right at the net, stick on the ice, right on my tape.
"And I put 'er in."
Mackey appeared in six games at the NHL level over the course of the season, logging about 14 minutes per game in ice time, including a season-high 19:10 in the final act at the Scotiabank Saddledome.
The 24-year-old also dressed in 27 tilts with the Flames' AHL affiliate, the Stockton Heat, scoring three times and adding 13 helpers en route to being named a league all-star.
He then closed out his impressive rookie campaign in Riga, Latvia, where he represented the U.S. at the 2021 World Hockey Championship - winning bronze in his first-ever international soiree.
Indeed, the record is awfully impressive.
But with two camps, a full year, and all that all-important first tuck out of the way, Mackey knows the spotlight will be even bigger when camp opens in a few weeks.
"I have expectations of myself and the Flames have expectations of me,"
said Mackey, who inked a fresh, two-year pact with the club on Wednesday
. "But I think overall, I know what I have to do going into camp and what game I need to play. I'm going to be me and play my game. I'm excited to get going here and to see everyone. It's going to be an exciting time and with the fans back, too, it feels like a whole new environment.
"With COVID last year, no fans, and now coming in - it's kind of like my first year all over again."