Someone will correct me if I'm wrong, but I think he just kind of snatched the ball off the kid, who was stalling.
Edit^: well that's even worse. No need at all.
He pushed him back on to his seat, tbf the lad didn't hold on to the ball for too long imo.
Cabaye didnt do the right thing obv. Way out of order. But fuck me, kid was kind of asking for it. He pulled the ball back when Cabaye tried to take it.