For the Maple Leafs, this was the ideal fire drill. And Mikhail Grabovski brought the hose. Losing goaltender James Reimer in the midst of a hyper-intense Saturday night against the Canadiens at the Bell Centre was a test of their early-season gains and they survived a shaky relief perforamnce by Jonas Gustavsson for a 5-4 overtime win. Grabovski, a severely disliked ex-Hab, spun out of the corner to beat Carey Price after a late tying goal by Nikolai Kulemin. Reimer suffered either a head injury or upper body contortion in two collisions early in the game and Gustavsson was parachuted in to start the second period. This night was a demolition derby of goalies, with Price getting his share of Leafs in his face. But the Leafs extended Montreal's horrid start to 1-5-1. Mike Cammalleri drew Montreal even 1:27 into the third, Josh Gorges gave them a 4-3 brief lead. But with 6:53 to play, the restored line of Mikhail Grabovski, Clarke MacArthur and Kulemin came out of hinding on Kulemin's goal off a scramble. Reimer had his masked knocked clear off by Brian Gionta's trespass, which might bring a league review, and was bent backwards by Travis Moen on a collision following his short-handed goal. Reimer finished the period, however, his biggest save being a stretch to stop Tomas Plekanec late in the frame. Gustavsson, who had not won since Jan. 6, had been burned six times on 43 shots in Boston two nights earlier and with the Leafs not playing back-to-back for two weeks, had likely been looking at a long spell on the bench. If Reimer is hurt long-term, Ben Scrivens will get his well-deserved chance since moving up to the Marlies last year and doing well in training camp.