The battle ended quickly, but it could have been over even faster. The Immortal Sword Intention was not merely boasting when it claimed to crush the Nine Swords Intention. Out of respect for his seniors, Lu Bei went easy on them.
He needed to gain experience, but he also needed to play his role properly. Otherwise, the next time, they might not put in the effort, and he'd be the one at a loss.
Earning experience was important, and doing so with some acting skills didn't hurt.
It took enough time to finish a cup of tea to end the battle, leaving ample time before the next assessment. Lu Bei waved his hand, casting a green light on the seven figures, and once their injuries were mostly healed, he offered them tea and wine.
Oh, and a few Three Pure Peaks roasted geese as well. He'd been honing his cooking skills recently as a side gig and took it pretty seriously.