Al Horford set a new tone for the second half after a rough first 24 minutes.
In Game 2 of the Boston Celtics' matchup against the Chicago Bulls, Horford attacked the rim for a huge dunk over Robin Lopez. A few possesions later, Horford posted up on Lopez, and shook him on a spin move to the hoop for another two points.
Lopez dominated the Celtics on the boards in the first half, but Horford's physicality seemed to make a statement that the Celtics weren't getting pushed around any longer.
Watch the dunk in the tweet below or in the video above.