Coaching in the NBA is a rough business, Derek Fisher says. So he was not all that surprised to hear about the housecleaning that took place in Brooklyn on Sunday.

“You never want to hear the news about somebody losing a job, no matter where they work, but there’s no surprises in the NBA or in pro sports,” the Knicks’ second-year coach said.

The Nets announced earlier in the day that coach Lionel Hollins had been fired and general manager Billy King had been reassigned within the organization.

Jason Kidd, who coached one season for the Nets before leaving to coach Milwaukee and being replaced by Hollins, was at the Garden with the Bucks on Sunday night. Kidd, recovering from hip surgery, declined to comment on the situation.

Joe Prunty, who is the Bucks’ acting coach while Kidd is recovering, was on Kidd’s staff with the Nets. He said it’s hard to say exactly what went wrong for the Nets, whose 10-27 record is the third-worst in the league, better than only the Lakers and 76ers.

Said Prunty: “I, we, have been gone for a bit. I don’t know all the things that go on there on a daily basis.”

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Fisher relates to Calderon

Jose Calderon predicted that Knicks fans would be upset with him after he missed a three-point attempt at the buzzer in the Knicks’ 100-99 loss in San Antonio on Friday night. One person who wasn’t upset with him is Fisher.

“Jose’s doing his job. I definitely can relate to his experience in terms of being in a system where the lead guard is not asked to do the same things that the point guard on the other team is being asked to do,” said Fisher, who played point guard in the same triangle offense for Phil Jackson with the Lakers. “So statistically, you’re going to look like you’re not as capable of doing things on a given night, and that’s frustrating because you know you’re capable of doing more if you’re asked to do more.

“The equalizer is winning. That’s what basically shuts people up. If you lead your team to victory and you score two points, I think that’s what works best.”