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:

Paul George's buzzer-beating three-pointer puts the Kawhi Leonard-less Clippers up 20 against the Grizzlies

Splash Cousins hits the straightaway 3

Devin Booker I'm the type to just focus on the next game So play by play possession by possession They say nobody's ever done it before that's exciting

Haywood Highsmith with the buzzer-beater corner 3 off an assist by Tyler Herro to end the 1st half with replays