Captain Kyle Storer admitted a poor second half had cost Cheltenham Town as they were edged out 2-1 by Coventry City at the Ricoh Arena.
Striker Mo Eisa grabbed his tenth goal of the season - and eighth in Sky Bet League Two - to get the Robins back into the game in the West Midlands.
But a second half strike saw the Sky Blues net the points and leave Storer to reflect on what might have been after a promising first half display full of chances.
"We're frustrated because we let ourselves down second half," he said.
"The game was even at times in the first half and we had some unbelievable chances that we have got to finish off.
"We started sloppy but showed character to come back into the game. We had a strategy, but really should have been leading at the break.
"They came at us in the second half and we didn't show that mental toughness and game management.
"Our clearances weren't good enough and there wasn't a team energy in the second half.
"Moving forward from this, we have got to put it behind us as soon as possible and Barnet is now a six-pointer.
"Our home form is keeping us in touch, but our away form has got to pick up."