Brian Kelly slammed his fist down during the post-game press conference Sunday in disgust after he watched his No. 13-ranked LSU Tigers lose No. 23 USC 27-20.

The Tigers held a four-point lead with just under six minutes left before letting their third straight season-opener slip away.

“We had some guys play their butts off tonight and we’re sitting here again, we’re sitting here again talking about the same things!” Kelly said as he slammed the table. “About not finishing when you have an opponent in a position to put them away. But what we’re doing on the sideline is feeling like the game is over.”

Woody Marks scored on a 13-yard run with 8 seconds left. Miller Moss passed for 378 yards and a touchdown and his 20-yard completion to Kyron Hudson and a subsequent targeting penalty on LSU with 18 seconds to play set up the winning score.

The LSU coach said his team lacked a “killer instinct.”

“I’m so angry about it that I’ve got to do something about it. I’m not doing a good enough job as a coach,” Kelly said. “I’ve got to coach them better because it’s unacceptable for us not to have found a way to win this football game. It’s ridiculous. It’s crazy.”

Moss outdueled LSU’s Garrett Nussmeier, who completed 29 of 38 passes for 304 yards with two touchdowns and an interception on the final drive. Moss was similarly efficient in going 27 of 36 in a battle of QBs who waited their turns after sitting behind the two most recent Heisman Trophy winners, LSU’s Jayden Daniels and USC’s Caleb Williams.

“Unfortunately, it’s clear that, when we get up in a game, we do not know how to handle ourselves,” Kelly said. “You’ve got to put teams away. We had an opportunity to put this team away. We get complacent, we make more mistakes when we’re ahead instead of having a, you know, better focus and a steely eyed killer instinct. That’s disappointing.”

The Associated Press contributed to this report.