BUFFALO, N.Y. — Maybe the worst 12 minutes of the season will be a turning point for the Colorado Avalanche. Even if it isn’t, it did set up one of the wildest comebacks in recent franchise history. The Avs spotted the Buffalo Sabres a four-goal lead, still trailed by three after 40 minutes and then roared back for a 5-4 win Tuesday night at KeyBank Center. Nathan MacKinnon scored twice, Artturi Lehkonen added the game-winner and Scott Wedgewood made 22 saves in 48 minutes of shutout relief to help the Avs avoid what looked like an ugly start to this season-long five-game road trip. “After the first 12, it was pretty good,” MacKinnon said.