Anyone who often stabs people knows, unless a knife is stabbed into major arteries or the heart, it won't kill a person. Even if some die, it's due to excessive blood loss.
Bai Yulan, someone who studied dance, clearly has no experience in stabbing people.
She stabbed Professor Meng in the back, causing him immense pain but not much harm.
However, a shot from Officer Ye, no matter where it hits, will cause significant damage.
Bai Yulan was shot in the chest, causing her to fall backward.
It wasn't because Officer Ye's aim was perfect; it's because the cliffs were too close to each other.
In fact, Wangchun Ridge only has one peak, but nature's craftsmanship split it into two, separating it into West Ridge and East Ridge.
But West Ridge is steeper than East Ridge, which is why, despite Officer Ye reaching Wangchun Ridge first, he arrived at the cliff top after Professor Meng.