Oh, how the times have changed.

Just last week, the Chicago Bulls were feeling good about themselves, having taken the first two games of their first-round playoff series from the top-seeded Celtics in Boston.

Now, though, the Celtics have clawed their way back into the series, winning the last three games and pushing coach Fred Hoiberg's squad to the brink of elimination.

With the drastic shifts in his team's fortunes, Hoiberg has gotten increasingly angrier with officials and the media alike. Following a Game 4 loss earlier this week, he called out the refs for not whistling Boston star Isaiah Thomas for more traveling violations:

"Let me say this, Isaiah Thomas is a hell of a player," Hoiberg says in the above video. "An unbelievable competitor - he's a warrior, everything he's going through right now. He had a hell of a game tonight. But when you're allowed to discontinue your dribble on every possession, he is impossible to guard. He's impossible to guard when you're able to put your hand underneath the ball and take two or three steps and put it back down. It's impossible to guard him in those situations."

Naturally, after dropping Game 5 in Boston on Wednesday night, Hoiberg was asked if he thought Thomas was carrying the ball again.

This time, as you can see below, he wasn't in the mood to discuss the topic, issuing a terse response of "no" before standing up and angrily exiting the postgame press conference:

Thomas finished the game with 24 points, so the Bulls were able to limit him somewhat after his 33-point Game 4 outburst. However, 11 of those points came in the fourth quarter with the game on the line.

The key to Boston's success on Wednesday, though, wasn't Thomas's offensive play - it was the play of Avery Bradley on the defensive end.

After watching as Jimmy Butler scored 33 points while going 19-for-23 from the free-throw line in Game 4, Bradley limited the Chicago star to only 14 points and one free-throw attempt (which he missed) in Game 5.

That wasn't the only contribution Bradley made, though, as he tied Thomas for the team lead with 24 points of his own.

After the game, Dwyane Wade told ESPN.com that Bradley's offensive outburst was what really hurt the Bulls:

"Everyone knows he's a good defender. Tonight, he got his offensive game going," Wade said. "You expect him to do what he does defensively, but we gave up 24 points to him tonight. He hurt us offensively tonight more than anything."

Whatever the case may be, the Bulls now have their backs up against the wall and need to find some answers quickly or their season will come to an unceremonious end. If the Bulls lose four-straight games after taking a 2-0 series lead, one can only imagine how unhappy Hoiberg will be.