Alternate angle shows that, after the buzzer sounded, Devin Booker walked over to the Clippers bench to taunt/gloat. The shove by Cousins followed shortly after:

Clippers announcer Brian Sieman with the amazing reverse jinx to ice Dame Lilliard and Blazers

DeMarcus Cousins welcomes Buddy Hield into the NBA with a block!

Devin Booker crashes on the monitors with his head and spills stuff on Kevin Harlea's notes The notes are ruined The whole thing is messed up

Celtics beat the buzzer twice in a row from the midrange with replay