He was employed by the Nets but I'm not sure I've ever seen any security run onto the court in such a situation...
...At one point, with less than five minutes left in the third quarter, Durant and P.J. Tucker were nose to nose, speaking heatedly, as though they were upset. Durant’s personal bodyguard, who is on the Nets’ payroll, charged the court to break them up, and shoved Tucker. The Bucks’ crowd, at full capacity for the first time this season, serenaded Kevin with “f— KD” chants...