The umpire speaks to Sukamuljo: "Kevin, do not flick. Do not flick." [he must have protested that he didn't flick] she says "You did". What is she talking about?
Presumably, his sweat. Players are not allowed to flick sweat on the court - the green surface - but can on the carpeted area - blue surface.
Kevin, no sweat throwing, would easily convey what had happened. The caption on the video read QF | WD ... !!