Tuesday, with no Kevin Garnett  and Greg Stiemsma , the Celtics  had to look somewhere for bench help to support Ryan Hollins , and it was the newly-acquired Williams who got the look-see.
In nearly 20 minutes, he scored five points, hauled down two rebounds, had two assists and yes, blocked two shots in Boston’s 78-66 ugly duckling win over the Heat at the Garden.
‘It was OK,” Celtics coach Doc Rivers  said of Williams Tuesday. “He’s a shot blocker, doesn’t know a lot of our stuff. You know he was pressing early; him and Ryan they were pressing way too much early on. And I thought as they settled in, one thing I did like about Sean down the stretch: he’s competitive. And you can see that. He wasn’t going to back down to anything, got some great blocked shots, so that was good to see.’
So, back in Boston, Williams had the juices flowing in the first half, almost too much. Rivers could tell he was a bit nervous, and Williams didn’t deny that.
‘Yes I was a little,” Williams said with a smile. ‘You go out there your first time you get tired real fast, your legs get down on you real quick, everything kind of shuts down on you so I caught my second wind I guess in the second half.’
Technically, Williams is eligible for Boston’s playoff roster since he waived by Dallas before the March 23 NBA deadline for rosters. Could he help off the bench as a shot-blocking force if Stiemsma’s sore feet act up?
‘I’m just trying to come in here and help these guys reach their goals, getting that 18th ring, that’s all I’m focused on,” Williams said. ‘I’ll let Doc decide that. Its not up to me. I just come here every day and try to get better at what I do.’