尽管笑面树骑士莱安娜击败三个骑士需要很大的运气成分（他们的水平未知），但这并非不可能。

While Lyanna-as-the-KoLT would require a great deal of luck to defeat three knights (even though their level of skill is unknown), it's not entirely out of the realm of possibility.

youdao

高文也中途作罢，只有三个骑士——博斯、珀西瓦尔和加拉哈德由于纯洁无暇在戈比尼克城堡见到了圣杯。

Only three knights---Bors, Galahad, and Perceval---were pure enough in life to find the Grail in the castle of Corbenic. They took the Grail to the distant city of Sarras.

youdao

若陛下高兴的话，我们三个都是骑士。

If it please Your Grace, we are all three knights.

youdao