The Sixers and Celtics exchanged punches all night long, but a few plays down the stretch doomed Philadelphia as Boston recovered home-court advantage and took a 2-1 series lead. Here are six thoughts on the game. Adem Bona answers the call Bona had to follow the slight letdown that was Joel Embiid being ruled out two hours before the game. To his credit, after some very up and down moments in Games 1 and 2, Bona was crucial to the Sixers getting off to a stable start in Game 3. One of the luxuries of being young and athletic (and slightly undersized for a big) is that you are usually more switchable on the perimeter. The Sixers leveraged that to keep the ball contained on Boston's possessions. Rather than a hedge or a drop to get the defense rotating on the back side of actions, the Sixers just switched in their ball screen coverage. They were clean and communicative with those switches, making rotations on the back side easier and shorter.…