Article Photos: OKC Thunder: Kendrick Perkins and Dirk Nowitzki exchange 'pleasantries' 20/51

Oklahoma City's Kendrick Perkins (5) has words with Dallas head coach Rick Carlisle, right, as Thunder assistant coach Maurice Cheeks holds back Perkins during Game 2 of the first round in the NBA basketball  playoffs between the Oklahoma City Thunder and the Dallas Mavericks at Chesapeake Energy Arena in Oklahoma City, Monday, April 30, 2012. Photo by Nate Billings, The Oklahoman