Colback had a great chance with a volley at 1-1.
He told safc.com: "We're massively disappointed - to lose the game to a free kick as well was a huge disappointment. We had our chances as well - Catts' header and I missed one.
"I was trying to get forward as much as possible and with Stephane [Sessegnon] up front on his own I was trying to get forward as much as I could to support him.
"I can't remember who put the ball in but Seb knocked it down for me and if anything I think I caught it too well and sadly it went over.
"If those had gone in we maybe could have been looking at something more than just a point but we're just so disappointed not to get anything."