Miami won Saturday's game to take a 2-1 lead in the series, but it was the battle between the duo which caught the attention of most people and convinced Stephenson that he was inside the four-time MVP's head.
"To me, it's a sign of weakness," the 23-year-old told reporters. "[People] used to say that to me. I'm going to do something to get you mad. Now he's trying to do it to me.
"I feel like there's a weakness and I feel like I'm doing something right to get underneath his skin."
Game four of the series takes place on Monday night.