Arsene Wenger admitted Andy Carroll exposed the weaknesses which have all but cost Arsenal the title this season.
West Ham striker Carroll grabbed a hat-trick in eight minutes to leave Wenger's hopes of landing the Premier League crown in tatters.
Laurent Koscielny's equaliser rescued a 3-3 draw for Arsenal, but they now find themselves 13 points adrift of leaders Leicester with just 18 to play for.
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And Gunners boss Wenger admitted that, not for the first time this season, his side could not cope with an aerial assault as Carroll ran riot.
"Why did we struggle with Carroll? Because he's good in the air," said Wenger.
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Gunners exposed again
"We had a good game but a bad result, and we paid for a weakness we have had all season - headers in our box."
However, Wenger did question whether Carroll should have still been on the pitch after escaping with a yellow card for a nasty challenge on Koscielny early on.
"Yes, of course, he was lucky to finish the game," added the Frenchman. "But that doesn't mean we have to concede goals from headers, we have to look at ourselves."
They were 2-0 up and seemingly cruising to a third-straight victory by the 35th minute thanks to slick goals from Mesut Ozil and Alexis Sanchez.
Carroll takes advantage
But Carroll, making a rare start in what has been another injury-hit season for the Hammers, turned the game upside down with his first treble since August 2010 for Newcastle.
First, the former Liverpool frontman got on the end of Aaron Cresswell's cross to power a header in at the far post.
And moments later, in first-half stoppage time, Carroll acrobatically turned in Mark Noble's centre at the second attempt to haul his side level.
Carroll was not finished there, though, and completed his hat-trick when he nodded Michail Antonio's cross home to perhaps stake a late, late claim for an England call-up for Euro 2016.
But Arsenal dragged themselves level in the 70th minute when West Ham failed to clear Hector Bellerin's cross and Koscielny lashed the loose ball home.
Title hopes in tatters
Arsenal's title bid is realistically over but Wenger vowed to keep fighting until the end of the season.
"We are third on 59 points and that's not where we want to be," he said. "We have made it much more difficult to have a chance to win the championship but no matter, we have to keep going.
"You never know what will happen, and we have clubs chasing us as well, so we have to be serious and focus on finishing as high as possible."
A point apiece was of little use to either team with West Ham still falling just short of breaking into the top four.
"It's a blow," admitted manager Slaven Bilic.
"I am so proud of my team to come back like that before half-time and then to be better than them in the second half.
"Now Andy is fit and we hope he will stay fit. There aren't many players capable of doing what he is doing.
"I'm proud of everything. We were spectacular. But the only thing I'm not happy about is the result."
Should Andy Carroll go to the Euros? Let us know in the comments!