One of the top slogans for the Avalanche this season is: We don't lose two in a row. After 15 games of their NHL season, the Avs still haven't. On Friday night before a near-sellout crowd at the Pepsi Center, the Avs won a thrilling 4-2 decision over the Calgary Flames to improve to 13-2. "That's what we've been telling ourselves. We're doing our best to try and make it stay that way, and tonight was a big win for us," said Avs defenseman Erik Johnson, who needed X-rays after the game following a big blocked shot to preserve a one-goal lead with about seven minutes left. More will be known on Johnson's possible injury Saturday. What looked to be a rout for the Avs turned into anything but after Colorado took a 2-0 lead on Paul Stastny's power-play goal in the second period. To that point, the Avs had been all over the Flames and drawing penalties with their aggressiveness. But the game started to turn after a Nick Holden interference penalty that wiped out the rest of an ongoing power play for the Avs. Pretty soon afterward, Mike Cammalleri had scored the first of two second-period goals for the Flames. Both goals were the result of low interior passing from linemates Jiri Hudler and Mikael Backlund. The Avs still managed to cling to a 3-2 lead after two thanks to John Mitchell's second goal of the season, but Calgary had the ice tilted toward the Avs end much of the period, outshooting Colorado 14-11. "(Calgary) deserves a lot of credit. It's a team that works really hard and for the second of back-to-back games, they had good legs, skating well. At the same time, I thought we played a good game too," Avs coach Patrick Roy said. "I think it's important now that we start playing a lot of games to get in game shape.