It was a missed penalty from Vermaelen which saw Arsenal lose their Capital One Cup shoot-out at Bradford.
The Belgian defender, however, maintains the squad were determined to put that bitter disappointment behind them as soon as possible.
"You can't stand still too long with a defeat like that - you just learn from it and move on," he said.
"We had a lot to prove. A lot of people questioned us and maybe that's normal, but we wanted to perform against Reading and we did that."