It’s not every day an NHL coach attends a postgame news conference wearing a massive bull mask, but a bet is a bet to Nashville’s Peter Laviolette. “Making good on a deal with the players that I had,” he said when asked why he wore the mask after the Predators’ 3-0 victory at Edmonton on Saturday. “We had a challenge to come into Western Canada against two good hockey teams, take four points, and this is the back end of the challenge. It was going to be a tough trip. We threw it out to the players,” as to what his end of the deal would be. It’s related to a bull named Bushwacker, a three-time Professional Bull Riders world champion, and his record of 42 straight buckoffs. Really. In any case, the Predators (7-1-0) have won five straight games, the NHL’s longest active win streak, despite losing goaltender Pekka Rinne to an undisclosed injury Friday. Juuse Saros finished that game and had a 31-save shutout the next day at Edmonton, helping Nashville became the first team to hold Oilers forward Connor McDavid scoreless this season.