Avalanche rookie A.J. Greer emerged from the trainer’s room Thursday night with a bloody right hand, which was protected by a surgical glove. He said the wound was from a previous fight — not the one he had just been in with Dallas’ Greg Pateryn. Pateryn got the better of Greer in that fight midway through the third period, but Greer, 20, wasn’t deterred from his game. After serving his five-minute major for fighting, Greer and the Stars’ Julius Honka drew roughing minors from an incident in front of the Dallas net. Greer, 6-foot-3 and 204 pounds, is trying to break into the NHL as a power forward with an edge. “It’s a big part of his game. He’s an abrasive guy out there,” Avalanche coach Jared Bednar said of Greer after Friday’s practice. “We saw it through rookie camp. We saw it in Burgundy/White (scrimmage). The key for him is to continue to do that against NHL opponents. We’ve talked about him. He’s a hungry guy. He’s pushing to make our hockey club and I think that’s the way he’s got to play.” Greer says playing angry hockey comes naturally. “I’m a big body out there and I have to disturb people to get under their skin,” he said. “It’s my job, and I play better when I’m able to get under their skin.”