Nottingham Forest manager Mark Warburton said he was disappointed to let down the supporters packed inside The City Ground following the 3-0 defeat to Sheffield Wednesday.
The Reds suffered their fifth home league loss of the campaign against managerless Wednesday and Warburton pulled no punches in his post-match interview.
He said: "We've lost 3-0 at home so I can't give any positives. We went behind to a wonder-strike early on but then we created a lot of chances, including three one-on-ones, and we needed to put the ball in the back of the net and take our rewards.
"I'm totally bemused by the decision for their penalty. We've watched it back time and time again and I just can't see it. Then instead of going into half-time one or two goals ahead, we went in 2-0 down and the huge crowd here rightly got anxious.
"We've let the supporters down in the second half and we never showed our quality to take something from the game. In the first half, despite being 1-0 down, I still felt very confident that we'd create chances and get back into the contest but if you don't take your rewards then it doesn't matter."
Forest had started brightly but were stunned by Adam Reach's superb opening goal for the visitors and Warburton believes his side didn't get their rewards for a decent first-half display.
He said: "It definitely hurt us in the first half going in 2-0 down despite creating the majority of the chances. In the second half we just lacked that little bit of quality in the final third and our movement off the ball certainly wasn't as good as it had been.
"We had a young side out there today but they weren't picked based on their age, they were picked based on their ability and quality. A lot of thought went into the team selection but unfortunately nothing went right for us today."