Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
The context here is that an elevator fell and someone died in the fall
I understand the sentence but i can't wrap my head around 線's meaning here
This 線 refers to a possible way of thinking, a possible solution (among others), an approach, etc. This is often used in detective stories.
8. line (of action); position; approach; policy; principle (jisho.org)
Required, but never shown