In the final play of the game, after Reeves made a layup to secure the victory, there was still one second left for the Warriors. In a high-level competition like this, a lot can happen in the last second. Not to mention that the opposing team, the Warriors, had a player named Curry, who had just scored 17 points in the fourth quarter and made eight three-pointers. It's not impossible for him to hit a 25-meter super long three-pointer.
After Reeves' buzzer-beater, notice that all the Lakers were celebrating with raised hands, even Christie had both arms up, but James chose to refuse celebration. Instead, he took a big step forward and rushed in front of Curry to start interfering with his catch, determined not to let Curry easily shoot the ball.
As Curry took two steps forward to shake off James, there was only 0.1 seconds left, and he was already out of time when he shot. Even if Curry had really made the super long three-pointer, it would have been too late. At this point, the game was over, and James finally walked to the sidelines, tightly touching Reeves' head to encourage him and celebrate with his teammates.
This scene shows how excellent and determined to win James is. While his teammates were celebrating, James' first thought was not to celebrate, but to defend and hold onto the ball. He also fully defended in the last second before the game ended.
From a different baseline angle, it's clearer that after Reeves made the layup, Draymond Green wanted to quickly inbound the ball, but James rushed straight towards Curry without hesitation. He didn't talk about celebrating or not, he just couldn't let Curry get the ball and shoot. This is the best action James took compared to his other teammates.
At this moment, only James realized that the game was far from over. Green was entangled with his arm at the time, and as soon as Green shook off James, LeBron quickly went into position. People say he doesn't defend, but did you see him defending in this play? He is the only one who refused to celebrate and immediately engaged in defense among the Lakers players. This scene may be more shocking than the simple buzzer-beater.
