That foul call just manufactured 2 more free throws for the Hawks and basically took our best scorer off the floor for the rest of the 4th quarter.
That really horrendous foul call manufactured one FT for the guy allegedly fouled, Pachulia. Pierce manufactured the other by childishly throwing his headband to the floor. The captain of the Boston Celtics has to keep his composure in that situation, regardless of whether a horrible call has gone against him.
There's no way the refs are going to say "Paul's right. When I saw how angry he was and when the headband hit the floor, I realized I made the wrong call, so I'm going to reverse it."
What the ref is going to do, every single time, is the up the player and award a chance for a free point to the other team. If Paul conducted himself properly there and didn't throw the headband (or if he didn't wear a headband, and then would have had nothing to throw), the Cs would have been down only two int he final possession, a way better situation.
The fact that Paul Pierce didn't learn from his disgraceful behavior in the Tinsley incident at the end of Game 6 in the Indy series in 2005 is my biggest problem here. Obviously, throwing a headband and getting only one tech can't surpass getting two techs instead of going to the line and sating away the game, but you can't get techs and the end of close games in the playoffs.