A day after showing little fight defensively dominated in the paint by Detroit in a 99-88 preseason loss Nets Andray Blatche and Mirza Teletovic fought at practice. The two big men got into a pushing match Sunday and had to be separated by teammates. And after practice coach Jason Kidd said it wasn’t a good sign it was a great one.

“As you see we had a pretty spirited practice. That’s how we’re built’’ Kidd said. “It’s great. That’s competition that’s what it’s all about. This team is put together to compete at a high level and you saw that.

“There’s nothing wrong with competition and tempers might flare; but it’s all out of respect and playing hard. As a coaching staff and players that’s what you need.’’

A little testiness might not be the worst sign because the Nets should be a bit vexed after Saturday. They struggled defensively letting the Pistons shoot 51.4 percent from the floor and were dominated 50-32 inside the paint.

“We have to protect the paint if we want to be one of the top 10 teams in the league in defense. It is something that we’re concerned about because it has been two games in a row but this is preseason so we have time to work on it’’ Kidd said.

“It wasn’t good [Saturday]. Everyone knows that’’ said point guard Deron Williams. “We want to be a team that hangs our hat on defense. We didn’t do that yesterday. Defending the paint not giving up corner 3s we haven’t done that. That’s something we have to continue to work on. It’s team defense it’s not on any one person or two people. It’s the five guys that are out there. It’s team defense.’’

Williams was limited in practice sitting on a chair with his sprained right ankle wrapped in ice. He declined comment on reports he might not be ready for the Oct. 30 season-opener in Cleveland and didn’t have a clear timetable for his return. But he seems unlikely to play in any of the team’s three games over the next four days. beginning Monday night in Philadelphia.