Preseason basketball is usually low stakes. There’s no bad blood, just clean reps before the regular season starts. But tonight, inside TD Garden, the tone is far from casual. From the opening tip, Celtics vs Raptors has been a back-and-forth competition, with loud benches and physical play, culminating in a confrontation between Celtics head coach Joe Mazzulla and Raptors guard Immanuel Quickley that no one saw coming.

After hitting a shot in the first half, Quickley turned to the Celtics bench, making a ‘call #5’ motion, taunting them with his shot-making as the Boston coaches called a timeout. Seconds later, Joe Mazzulla turned to the smirking Quickley and shouted at him: “ Shut the f— up. ” Cameras caught the outburst, and the exchange was replayed on the Toronto broadcast, announce

See Full Page