What are the last four characters of the eight-character idiom "authority fan"?

The authorities are confused, but the bystanders are clear

dāng jú zhě mí, páng guān zhě qīng

Notes

The parties involved were confused by what happened. , but the onlookers could see it clearly.

Source

"New Book of Tang·Yuan Xingchong Biography": "The authorities call it a mystery, and watch the trial."

Examples

Who blames you? It’s true, but it’s something no one has ever said before! It can be seen that "~.

" (Chapter 13 of "Lao Can's Travels")

Usage

Complex sentence structure; used as object, attributive; with complimentary meaning