Northampton Town manager John Gorman was baffled by his side's woeful display in the FA Cup second round defeat at League Two strugglers Barnet.
The Cobblers led at the break thanks to Scott McGleish's goal but, in a disastrous second half, conceded four goals to Paul Fairclough's side.
A shell-shocked Gorman said: "In truth it could have been more at the end as they created even more chances.
"We knew they would be a bit more direct in the second half but we'd coped with that in the first half.
"They grew in confidence and that swung the game. Maybe we scored at the wrong time and would have been better going in at 0-0.
"I had some harsh words afterwards but that alone won't make a difference. It's no use going mad at them.
"We need to look for answers and we'll watch the video and see where things went wrong."