Morecambe manager Jim Bentley was incensed after his side's 5-1 defeat to derby rivals Accrington Stanley.
The Shrimps arrived at the Crown Ground looking up towards the Play-Off places but Bentley admits the result on Tuesday night now has them looking over their shoulders at the sides below them.
"I am very disappointed. We were second best in every department and I am not going to make excuses - it was unacceptable," said Bentley.
"Our Achilles heel has been defending from set pieces and we have conceded two goals from corners at Accrington.
"I feel sorry for the fans but no one is hurting more than me - it was embarrassing and we have got to put it right.
"If we had won at Accrington we would have been two points off the play-offs but now we are suddenly worried about getting dragged back into the pack and, if we turn in many more performances like that, we will be.
"We need a centre-half and we need to work on set-pieces - even if it's 10 hours a day! I won't put up with performances like that."
Goals from Lee Molyneux and Kal Naismith sent Stanley into half-time in control before further strikes by Dean Winnard and Tom Aldred put the game beyond doubt with just 65 minutes on the clock.
Substitute Padraig Amond replied for Morecambe but Molyneux made it 5-1 with his second goal of the night in injury time.
Accrington boss James Beattie saw his side jump from 21st to 15th in the table with a much-needed win as they look to avoid the battle at the bottom.
"I am delighted with the performance, all the lads were tremendous," said Beattie.
"We started off on the front foot and never stopped. It's funny though as the defenders are more disappointed that they conceded one goal!
"But we passed the ball around well and we have a lot of talented players in our team and they showed it. The lads are enjoying their football.
"It was a big result - we are in a relegation battle and we need to motivate ourselves both physically and mentally now for every game."