Well, Kamura/Sonoda wasted so much energy trying to win that 2nd set. Just exactly what the Indonesians planned.
Chen Qingchen just want to concentrate in her last tournament in XD. If she gave full effort in WD, she definitely would win WD.
They were too hyped to win that game 2 especially when they are 18-11 or so up. little did they realise.