Some of Boston's inconsistency was inevitable. At one point Thursday night, Rivers had three rookies, Davis, and the second-year Banks on the floor. While that lineup offers all sorts of possibilities, it also invites trouble. First-year players can look like Bill Russell one night, as Al Jefferson did in Game 1, then Bill Murray the next. The postseason pace is faster, harder, more physical. It's a shock to the system the first time, and the Celtics' youngsters are learning that the hard way. Jefferson was clearly flummoxed Thursday night; conversely, Kendrick Perkins, in his first significant minutes of the series, looked like a gamer. Whether Perkins can build on that is anyone's guess.