If anyone figured the Stampeders might come out flat with top spot in the West already locked up, LB Dwaine Carpenter proved them wrong right away, crunching speedy return man Ian Smart on the opening kick-off.
The Lions cashed in on solid field position to open the scoring at 5:43, although QB Buck Pierce paid a price.
With the visitors threatening from the Stamps' 29-yard line, Pierce rolled out of the pocket and fired a pass downfield before he was steamrolled by Stamps LB Saleem Rasheed. The Lions pivot was slow to peel himself off the turf, but stayed in the game.
WR Paris Jackson dropped a pass in the endzone on the next play, and the Lions settled for a 37-yard field goal by Paul McCallum to make it 3-0.
It didn't take long for the Stamps to even things up.
The hosts marched the ball down the field, but after a pass intended for WR Ken-Yon Rambo fell to the turf in the endzone, K Sandro DeAngelis made good on an attempt from 20 yards to knot the score.
B.C.'s dangerous running back duo of Stefan Logan and Ian Smart moved the Lions back into scoring position, but McCallum missed from 37 yards out.
Calgary RB Demetris Summers made a nifty catch on the sidelines for a 25-yard gain at 12:18, pushing Stamps QB Henry Burris over the 5,000-yard passing mark for the first time in his career.
Four plays later, Burris faked a handoff to RB Joffrey Reynolds and gave the ball to RB Jon Cornish, who rumbled 21 yards into the endzone for his first career touchdown.
On the next drive, Logan lugged the ball into the red-zone, and Jackson made amends for his first-quarter drop, getting his mitts on a perfect 18-yard strike from Pierce to give the Leos an 11-10 lead after McCallum's convert.
Burris used almost every weapon in his arsenal as the Stamps marched the ball back into enemy territory, then hit SB Nik Lewis for an 11-yard touchdown to give the hosts a 17-11 lead at the half.
McCallum kicked a 43-yard field goal to bring the Leos within three, 17-14.
After an ineffective Stamps drive, Smart bobbled a punt and S Wes Lysack pounced on the fumble at the 33-yard line. A pass interference call moved the ball to the goal-line and QB Barrick Nealy plunged in for the major. DeAngelis made no mistake to put the Stamps up 24-14 at 5:11.
As two of the CFL's most explosive offences continued to trade blows, Lions WR Ryan Grice-Mullen shook off a pair of tackles and turned a short reception into a 67-yard touchdown.
LB Lemarcus Rowell put the Stamps back in prime scoring position with an interception -- losing his helmet as he leapt to grab the ball -- and the crowd was still saluting the defensive play when Nealy scampered in from 14 yards out to give the hosts a 31-21 edge at 4:38.
With two minutes to go, KR Markus Howell fumbled the ball at his own six-yard line, and Pierce immediately hit Logan for a major.
Thanks to a 49-yard hook-up between third-string QB Will Proctor and Rambo, the Stamps opened the final quarter on the one-yard line and Nealy deked in for his third touchdown of the day, putting the Stamps ahead 38-28 after DeAngelis' convert.
After the Lions scored a safety, Stamps S Milton Collins had a series to remember, dropping Logan in open field and then picking off Pierce at 5:38 to put the ball back in the hands of the offence.
The Stamps took precious time off the clock while Nealy slowly moved the offence down the field, capped by a 42-yard DeAngelis field goal to put the Stamps up 41-30 and set a career-high for points in a season with 217 and the second-best single-season total in franchise history.