Grant McCann was frustrated with the goals his side conceded in the 2-0 defeat to neighbours Huddersfield Town.
Tom Lees bundled in Danel Sinani’s ninth-minute corner to put the Terriers ahead and Duane Holmes curled home a fine second 17 minutes from time.
“We gave ourselves a mountain to climb (with the first goal),” said McCann.
“We felt it was a free-kick on Andy Cannon. We’ve watched it back and he’s got a huge cut down his shin from the tackle.
“The referee hasn’t given it but we should still defend the corner better; down to ten men or not, we should still defend the corner better.
“I think if you ask Matt Ingram, he’ll tell you he’s got to deal with that and punch it away.
“We rallied after that. They came on strong in the first 10-15 minutes but after that, we got into some really good areas, some really good balls delivered into their box.
“My analyst told me there were about 30 crosses into their box today and we haven’t got onto the end of one of them, which is really disappointing.
“Between both boxes – I’ve said it a couple of times before this season – our play was good but we have to be more ruthless at this level. You get big chances, you have to take them; we didn’t and we got punished.
“There was nothing else in the game apart from the set-play goals we conceded.
“The first one, we should deal with. The second one, Duane Holmes, we know he’s right footed; a big mantra of our game is to keep people outside us, we let him come inside.
“It’s a great finish but that shouldn’t happen – we should be keeping him outside and getting rid of the ball quicker.
“We had huge chances in the game which we didn’t take and that was the difference between the two teams.”