But incredibly, and despite his linesman apparently telling him it was a penalty, referee Dean Whitestone waved play on.
United had good chances either side of the penalty shout to win the game, with Mark Travers twice denying Gibbs-White and then Filip Uremović firing wide with virtually the last kick of the game when ideally placed.
“In my opinion, on the big moments in the game, we did more than enough to win,” Heckingbottom said.
“Everyone told me [it was a penalty] but I’ve seen it back and it was worse than described to me. I’ve been in to see the ref but I probably feel worse now. I don’t know why I bother.
“You go in and just come out more frustrated. They’re not going our way at the minute, those moments, but we’ll save them up and hopefully we get over the line.
“That’s the frustrating bit, we did a lot right and you want other people to do their jobs. When they’re blatant like that, that’s as black and white as they come and they’re the ones that really hurt.”
Told that the linesman had said to the referee that it was a penalty, Heckingbottom said: “It doesn’t make me feel any better. It’s gone, what can we do? But it’s as blatant as they come. We want to get some of those now.”