Share this: J.R. Smith apparently has a little too much pent-up energy. The Cleveland Cavaliers guard is nearing a return from right thumb surgery but did not suit up for Saturday’s game against the Miami Heat. That didn’t stop him from being the center of attention, though. As time wound down in Miami’s blowout win, television cameras caught Smith barking at Heat guard Dion Waiters from his own bench. When the buzzer sounded, Smith only became more agitated, yelling at several Heat players. He had to be held back by the Cavs’ security team and forcibly escorted from the court. [embedded content] So, why was Smith so incensed? Apparently he took exception to Rodney McGruder’s late dunk, in which the Heat forward seemed to take