My thoughts

For reference only, there are the following possibilities:

1

Kakashi suffered from heavy fog.

magic

Not knowing Lin belongs to manslaughter.

to tell the truth

This possibility is really not great, because

Early times

Kakashi rarely remembers Lin when he recalls. If he kills Lin by mistake, he will regret it, not mentioning Lin and Kakashi rarely.

This man

Is a sentimental person. Besides, what illusion can be powerful enough to lose sharingan?

2

Lin was subjected to fog tolerance, and she didn't want to be manipulated by this technique, so she asked Kakashi to commit suicide. Lest you do something you don't want to do, or let yourself suffer. This possibility is not very high, why? Because at the end of the picture, Kakashi is very

Calm; calm

Without a painful face, with Kakashi's character, I don't believe he would calmly kill someone he wants to protect and cherish. This is something I can't believe, and neither can anyone. Kakashi is not such a cruel person. In that case, we must attack each other. Under normal circumstances, Ka Dian should be in tears.

three

Lin stood on the opposite side of Kakashi, or rather, she worked for Wu Ren, and she wanted to kill Kakashi. I believe it is Lin.

suffer

Yes, she won't help Wu Ren for no reason. Finally, she may wake up and decide to end herself by Kakashi's hand and decide to die.

companion

In my hands, this scene has been reproduced again.

Obito

Take a fancy to it. . . . .

So, Kakashi will kill Lin as.

enemy troops

In order to kill Lin, among the village, the mission, the enemy and his companions, Kakashi decided to do it himself, just like

Sasaki

The same. It is said that this possibility is a bit large, which is in line with Kakashi's subsequent actions.

The above three possibilities are myself.

idea

You can also use it as a reference, at least I think it is possible.

I hope to help the landlord.