Quarterback Dave Dickenson was perfect on a series of short precision passes, taking the Lions from their own 38-yard-line down the field for a touchdown and an early 7-0 lead.
Damon Allen failed to ignite the Argos offence early in the second quarter, despite two quick chances thanks to a punt return fumble by Aaron Lockett of the Lions.
A long completion from Allen to R. Jay Soward moved the Argos to the BC 20, and a 27-yard field goal by Prefontaine put Toronto on the board.
Allen began to find his receivers on Toronto's next drive, hitting Robert Baker for a 35-yarder and a 20-yarder to move inside the Lions' red zone.
The field-position advantage enjoyed by the Toronto Argonauts in the second quarter continued on the opening drive of the second half, as Allen got the ball at midfield.
The Lions defence got its best pressure of the game on Bishop early in the fourth, forcing an errant pass then nearly causing a fumble on the next play.
Warren ran for 30 and 15 yards, setting up a Lions touchdown on Dave Dickenson's five-yard rush and dive into the end zone.
Dickenson just missed a streaking Geroy Simon's outstretched hands to stop the next BC drive, and Toronto took over again with a short field.