Smart hit Spurs forward Matt Bonner in the groin area midway through the fourth quarter and was automatically ejected.
Smart said after the game that he was trying to rip through a Bonner screen and had accidentally hit him.
This was the second time this month that Smart was ejected for overly aggressive play.
While his playing time has been sporadic,
"I told [Pressey], he's a really valued member of our team," Stevens said. "In our organization, he works the right way. If he doesn't play, he's the loudest guy on the bench; and if he does play, he's an energizer. He's not going to play perfect, but nobody is, and if you can sustain that and not get down and be confident, there's always a role for you. And that's a great compliment."
Pressey has scored 22 points over the last three games and said it has not been easy adjusting to erratic playing time.
"It's tough to continue to do it every single day, but Coach has been telling me that you never know when your time is going to come so just stay ready," Pressey said.
"Him responding and just being ready is a real testament to Phil," Stevens said. "If he doesn't play he's the loudest guy on the bench and if he does play he's an energizer."
Pressey was sent down for the first time in his two-year career on Thursday. In 31 games for the Celtics, he has averaged 3.2 points, 1.4 rebounds and 2.1 assists in 11.6 minutes per game.
Dawkins was signed to a second 10-day contract on Monday. He has made four appearances for the Celtics, averaging 5.5 minutes per game off the bench.
After sitting out three of Boston's last four games, Pressley, a second-year pro, will be making his first appearance in the D-League. In 31 games for the Celtics, he has averaged 3.2 points, 1.4 rebounds and 2.1 assists in 11.6 minutes per game.
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