Former Boston Celtics great Paul Pierce was so confident in his team in Game 2 against the New York Knicks, he said he would walk to work barefoot “in my robe” if they lost for a second straight game in the second-round series.

“If the Celtics lose Game 2 at home, I promise you, I am walking here tomorrow,” he declared on an FS1 show Wednesday. “I guarantee this one. Put the house on this game.”

That didn’t turn out so great. The Celtics blew a 20-point lead in Game 2 on Wednesday night, as they did in Game 1, and lost 91-90.

Pierce appeared to honor his vow Thursday, saying he set out before the sun rose for what he said was a 20.2-mile commute to work in the Los Angeles area. He posted updates on Instagram Live. Pierce made the wise choice of not walking barefoot, but bath-robed? Yes.

“All right, time for me to get to steppin’,” he said after 5 a.m. Pacific time, calling himself a “man of my word.”

“I cant believe the Celtics got me out here like this, dog,” he said in a later update. “I’m really walking out here like this.”

A little before 9 a.m., Pierce posted another Live of a couple of hecklers on the sidewalk.

“You lost that bet, huh?” one of them said.

Pierce took it all in stride, having some fun with them. He said he was about halfway at that point.

He posted another video saying he arrived to work at around 1 p.m.

ROUGH REPLAY

The Denver Nuggets held what essentially was a group therapy session Thursday after their 43-point demolition at the hands of the Oklahoma City Thunder in Game 2 of their second-round playoff series.

“You can’t just say, ‘Hey, let’s just have a mental day. Move on. We’re good, we split,” interim coach David Adelman said. “That’s not the case. If we want to win Game 3 things have to be different.”

Starting with their mentality, he said.

“In the NBA playoffs, a lot of the time the whistle and the way the game is played is who hits first,” Adelman said. “And I thought they hit first, second and third. ... And tomorrow we have to be the aggressor, and I expect us to be.”

Adelman said the film review, albeit uncomfortable, proved productive.

“A lot of guys had thoughts on what they felt last night,” Adelman said. “And that allows you to move on and do things better tomorrow night.”

Adelman said the general sentiment was one of embarrassment.

“There was a lot of people speaking up and saying, ‘I can do better,’ which I love,” Adelman said. “And then there’s the film never lies, that kind of thing.”

The series shifts to Denver to night, the Nuggets’ sixth game since April 29 whereas the top-seeded Thunder entered this semifinal series on nine days’ rest after sweeping Memphis in Round 1.

Denver survived a brutal seven-game series with the Los Angeles Clippers and 48 hours later beat Oklahoma City in the opener on Aaron Gordon’s 3-pointer that capped a frenetic comeback in the final minutes.