At the intermission of topsy-turvy contest, the Winnipeg Blue Bombers have bolted out to lead the Calgary Stampeders 27-19 at McMahon Stadium.

The Bombers took advantage of Stampeder mistakes to assume the advantage.

Responding to back-to-back miscues resulting in touchdowns that gifted the Manitoba visitors a 20-11 lead, Calgary quarterback Bo Levi Mitchell led the reigning Grey Cup champions, hooking up Reggie Begelton from 21 yards away for the slotback’s second major of the game.

Swiftly, though, Winnipeg answered back, quarterback Chris Streveler finding a wide-open Kenny Lawlor from 34 yards away in the end zone to establish the 27-19 lead.

The costly Stampeder turnovers, in a 1:18 span, began when Bomber defensive back Marcus Sayles stripped running back Ante Milanovic-Litre of the ball deep in Stampeder territory, scooping up the debris and motoring 24 yards for a touchdown.

The offensive snap following the kickoff, Mitchell was intercepted by Winston Rose, setting the stage for a 24-yard TD sweep by receiver Lucky Whitehead.

 The Stampeders vaulted in front 11-3 before the end of Quarter 1, Mitchell engineering a four-play, 75-yard drive punctuated by a nine-yard TD pass to Reggie Begelton, his eighth of the campaign, and an ensuing two-point convert toss to Richie Sindani.

Medlock then booted his second goal before Sayles took full advantage of the forced fumble.

Earlier, the teams traded three-pointers.

 Stamps’ kicker Rene Paredes connected on a 41-yarder after Mitchell aired out a pinpoint 55-yard pass to slotback Eric Rogers on the game’s first snap, the Calgary drive eventually curtailed by back-to-back drops.

The Bombers responded to equalize on their next possession, Medlock infallible on a 32-yard try.