Amir Khan told Ringside he regrets trying to fight his way out of trouble against Danny Garcia.
The Brit lost his WBA title in Las Vegas last weekend to the hard-hitting American.
Khan was stopped in the fourth round after being put on the canvas three times at Mandalay Bay and, seeing the bout back for the first time on Ringside, Khan says he should have tried to re-group rather than immediately return fire.
"We made a mistake dropping the right hand and I got caught with a big left hook," he said. "He caught me right on the neck, behind my head and I just couldn't get my balance back. Danny Garcia just put the pressure on then and won fairly.
"But I think I was too brave after the first knock down. Watching it back now I think 'why was I not holding onto him?' I was fighting back at times when I didn't have to fight back.
"I showed too much heart in that fight. When I got caught with the first shot you could see my legs were totally gone and I didn't recover from that first knock down. Maybe it was instinct and I should have taken a step back."
Khan was satisfied with his start to the fight and believes Garcia was fortunate to catch him so cleanly.
"It was a brilliant left hook and we all know Danny is a big puncher," he said. "But up until then my style was brilliant, using my jab. He just timed it so well. It was more a fluke shot really, hit and hope. Everything was going so well - but that's boxing. One punch changes a fight.
"If I'd stuck to the game plan I would have won the fight. He caught me with a shot many fighters have tried but not caught me with, but it was his night."
David Haye, who was in the studio following his victory over Dereck Chisora, agreed with Khan's assessment and insisted the Olympic silver medal winner will be back to fight another day.
"The shot Garcia landed on him was a fantstic shot but it was a shot he threw maybe fifteen, twenty times prior to hitting him with it and had always missed by a long way," said Haye.
"But Amir left himself in a position which he doesn't normally do and he got hit. Then he showed too much heart. If you've lost that round, you've lost that round. Do whatever you have to do to kill the clock, re-group and then come back. But only experience teaches you this.
"Amir lost against Breidis Prescott and showed the heart of a warrior by coming back. A lot of people wrote him off and said he can't take a shot yet he goes in with Marcos Maidana - who pound for pound is one of the biggest punchers in the world - and took his best on the button and came through with the right tactics.
"When you're fighting at the top, top level you can't win every time. He's still got seven, eight years at the top level. He just needs to take some time out and relax.
"It seems like since the Olympics he's been in fight after fight and it's a heavy schedule. Sometimes you need to chill out for a while."