It was an art show challenge, and both teams had to pick an artist they wanted to feature. Piers' team found out that one of the artists had multiple copies of her pieces, so they could sell the same piece to several people, so they went with her (he was project manager). Omorosa was PM for her team, and the art show challenge was what she was fired on the first time she was on the show.
It ended up being a total slaughter. Piers' team brought in something like $164,000, and Carol stole a couple of the contacts that Steven Baldwin brought in for Omorosa's team and got them to buy pieces from Piers' display. Omorosa's team brought in around $7,000. Trump said it was the worst beating ever in the history of the Apprentice.
As Piers was leaving the boardroom, pretty much knowing Omorosa was going to be fired, he said something like, "I'm going to enjoy watching this. Make it nasty, could you?"
In the boardroom, Omorosa tried to "out" Piers, saying that she believed he was in the closet. Her reasoning for this, the only one we saw her give anyway, was that he asked the guys to take off their shirts for a bunch of challenges. Trump told her she was out of line, and said to the camera that if Piers wanted to come defend himself, he could.
So Piers comes down to the boardroom, but instead of confronting Omorosa, he walks straight over to Trace, grabs his face in his hands, kisses him on the cheek (hard), and says, "Trace, I want you to know, you're a beautiful cowboy." And he leaves the room. Meanwhile, Trace looks absolutely horrified, sickened, offended. He's wiping his cheek and has the funniest, most shocked look on his face, and is totally confused by what just happened.
So, Trump fired Omorosa. The previews for next week's show had a blinkie on them saying it would be the first "Omorosa-Free" episode of the season. But they made sure to remind us that Steven and Piers don't get along well either, so there would be sure to be drama.