Fan Zhendong vs Koki Niwa, second set, the net ball that Koki Niwa misses at 2:2 (from 2'16 to 2'19 in the video above). I don't know if the guy sitting on the japanese bench is taking a nap, clueless about how Niwa's brain works or just a plain moron, but he completely missed the time out.
Or maybe there was nobody there. I hope so.