Morecambe boss Jim Bentley felt his side showed a lack of experience as they went down 3-2 to 10-man Rotherham.
The Shrimps twice came from behind to draw level through Jordan Burrow and Jack Redshaw.
But despite Ryan Cresswell receiving a red card ahead of the latter's equaliser from the spot, Lewis Grabban fired his second of the game in spectacular fashion to hand the hosts an injury time triumph.
"When one team goes down to ten men and you have just scored you hope you can go on and win it," said Bentley.
"We just lacked a little bit of know-how. It's so frustrating because it's a game we shouldn't have lost.
"I think a point would have been fair but the winner was an unbelievable strike. It's another game we shouldn't have lost."