If the Boston Bruins think they played perfect hockey in building their 2-0 series lead against the New York Rangers in the Eastern Conference Semifinals, they don't need to look back any farther than the second period of Game 2 to see how easily the series could be 1-1. "You can always get better," Bruins center Chris Kelly said Monday after practice at TD Garden. "I think our consistency throughout the course of the game can be better. I think the second period, we were outplayed. Tuukka [Rask, goalie] made some huge saves for us to keep us in that game."