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:

Randomly remembered this one time the Clippers commentator started talking right when a little beat kicked in at the arena and it sounded like he was rapping So glad I caught this one

Medina Klay on the addition of Cousins as well as on potential contract extensions

Devin Booker shows he can still fly finishing an alley oop from Khris Middleton

With just 0.2 seconds left on the shot clock, Gordon Hayward bounces in the inbounds pass to Trevor Booker, who promptly taps the ball backwards over his head and hits the shot to beat the buzzer!