Why when Pierce puts up 3 fingers must you all think he's throwing a gang sign? It doesn't make any sense, think it over. If you think about the other things he could have been implying, it makes a whole lot of sense. He was reminding Horford that he needs "3" more wins. Here's my view on it:
I think I heard this story the other day how Pierce and others were saying to the crowd at home in Boston that they (ATL) won't be back (at the Garden). And that Horford and the rest of the team caught word of it, and if you watch the tape it looks like Horford is saying to Pierce something along the lines of, "we're comin BACK"..as in they are coming back to Boston because they just sealed the game 3 victory. And in return, Pierce got a little upset and reminded Horford that he needs "3" wins before he can start talking.