BOSTON — Jayson Tatum and the Boston Celtics struggled in the second half against the Philadelphia 76ers, getting out-scored by 23 and losing Game 5 by 16 at home . Tatum finished with 24 points and 16 rebounds, but he had zero points in the fourth quarter and the Sixers were running away with their win.  Here’s everything Tatum said, with added analysis from me On the Celtics offense down the stretch: “First of all, give them credit. They played well. And yeah, a few looks that we felt good about that we just didn’t make. But sometimes that happens. You know, it’s just tough. Not scoring the way you want to puts a lot of pressure on your defense, and they made some plays at the other end.” Analysis : This is all true, but this was more than shots not falling. I could live with a “they were hot, Boston was not” where both teams played well and Boston just lost. The Celtics have to understand that their best offense comes from quick decisions, ball-movement, and attacking a team like Philadelphia.…