McCollum puts the moves on Harden and hits the layup

Melo waives off CJ McCollum for the last shot of the half

James Harden on haters: "You have the haters who talk about is that a travel, is that too many steps or why is he wearing this?”

Al Horford chases down Porzingis and swats his layup attempt

Kemba Walker hits the stepback jumper to extend the Celtics lead to four