By Ian Steven Cammy Ballantyne came back to haunt his old club as the former Airdrie defender helped sink 10-man Diamonds and sent them to the bottom of the Championship.
The North Lanarkshire side struggled to gain a foothold in the game leading to gaffer Rhys McCabe worrying about a “feel sorry mentality” at New Broomfield, with his side having lost four of their six Championship games so far.
Zak Delaney broke the deadlock four minutes before the break when he headed home. And after a red card for midfielder Rhys Armstrong, Ballantyne - who chose not to renew his deal with the Diamonds in the summer - fired in a low strike three minutes from time to make sure of the points.
Gutted Airdrie gaffer Rhys McCabe said: "There was loads of things I wanted to see better. I thought we had a look about us that was almost a kind of feel sorry mentality.