GUS Poyet revealed his relief after his Brighton side endured "incredible pressure" to hold onto their 2-1 lead over Millwall on Saturday.
The Uruguayan paid tribute to the Lions' second-half fightback with ten men – and admitted substitute Chris Taylor's red card was "very unfortunate".
Goals from Ashley Barnes and Adam El-Abd had given the Seagulls a comfortable lead as the match headed into its closing stages, but Millwall debutant Chris Wood scored his first goal for the club to set-up a dramatic finale.
"Something happened on Saturday that's never happened to us," Poyet said. "We were controlling the game when it was eleven versus eleven, but we lost it. We need to address that.
"I was delighted until the sending-off. We're supposed to know how to play against ten men. But we didn't do it. Maybe we were a little bit tired, maybe the crowd got up for it after the red card.
"Every corner for them looked like an opportunity, even if it wasn't a shot. It wasn't easy. I don't want to take any credit away from Millwall, because it was unbelievable in the last 20 minutes.
"Every corner, every cross, every second ball – it was incredible the pressure they put us under. You have to give them credit.
"It was a great three points. On another day, we don't win this game. I know Millwall needed to win and I hope they start doing well next week."
Lions manager Kenny Jackett felt that Taylor's sending-off for a challenge on goalkeeper Tomasz Kuszczak was "harsh" – and Poyet did not disagree with his opposite number.
"Tomasz got hit on his thumb," he said. "I can't say if it was dangerous or not, because it's unfair on the player.
"He's just come on, he's a player that could make the difference, and he got two yellow cards in 20 minutes.
"It was very unfortunate. The sending-off didn't help me. Taylor changed the game. My goalkeeper coach will probably say he deserved a red – I know Thomasz got hit on the thumb, but it was nothing serious."