The 21-year-old left his "good" pair of skates at home in Cochrane.
Enter the reserve set, found somewhere in the back, under the cobwebs and a rumpled stack of old DVDs.
Banged up, blackened and, it seems, a bit too small.
Whoops.
"They're like a year old," Dube said with a chuckle. "New gloves, too. I guess you can't really knock ALL the rust off until camp starts, anyway."
Coulda fooled us.
In what became custom at the Scotiabank Saddledome last year, and later with the Flames' AHL affiliate in Stockton, Calif., Dube was - true to the form - the last one on the ice during an informal skate Thursday, finishing off a nearly two-hour session with an exhausting series of one-timers that put those gnarly old wheels to the test.
Dube, naturally, has a keen eye on the roster. He knows the work that's ahead of him, but sees an opening to stick, full-time.
Which is why the visual of Thursday's grind spoke to the kind of athlete (and personality) the Flames are dealing with, and why the likelihood of another standout camp from the young pivot is all but certain.
"When I came in last year, I was probably the only one who thought I could make it out of camp," Dube said. "I definitely had that belief in myself.
"Honestly, looking back on it, I was probably lying a little bit to myself, that I could actually make the team. But this year, I definitely feel more confident that I can do it again and this time, be here from start to finish and have an impact, start to finish.
"That's the goal."
Dube earned a spot on the 23-man roster after tearing up the pre-season, scoring a team-leading four goals and adding a pair of helpers in all seven exhibition contests.
By December, he'd gotten a small taste of the bigs, but was then sharpening the saw with the minor-league Heat.
Recalled twice more to the big club, Dube finished the year with five points (1G, 4A) in 25 NHL games, but an impressive 39 points (15G, 24A) in 37 AHL tilts.
Turns out, he says, the time down south was the best thing for him.