Harlequins director of rugby Conor O'Shea described the 35-5 LV= Cup defeat to Cardiff Blues as "bizarre", given that his side dominated the possession and territory.
Quins only trailed 14-5 at the break at Arms Park but Cardiff ran away with it in the second period as they scored 21 unanswered points.
The hosts outscored the Aviva Premiership side five tries to one in the final round of the LV= Cup, with Filo Paulo, Gavin Evans, Dan Fish, Tom Williams and Marc Breeze on the scoresheet for Cardiff and Ollie Lindsay-Haugue replying for the visitors.
"The competitor in you is very disappointed with a result like that," said O'Shea.
"We hadn't conceded four tries in a match this season. But we had a lot of youngsters out there - we brought on two 17-year-old forwards in the second half - and it was great experience for them."
O'Shea thought his team should have been awarded an early try by Paul Trayford, but was most upset for his "outstanding" captain Tom Guest.
"It was his 200th appearance for us and I thought he was outstanding," he continued. "He deserved better than that."
Blues' recently-appointed backs coach, Paul John, agreed that the scoreline was somewhat odd and admitted his side were far from their best in the first period.
"We were giving the ball away in the first half and conceded a string of penalties, so goodness knows how we were 14-5 up at the interval," said the former scrum-half.
"In the second half we kept the ball better, played territory better and in the end it was very pleasing to score five tries and get a win for everyone."