The world rejects the message and authority of the two witnesses and when they have finished their testimony Satan is allowed to kill them. The world celebrates because they will be convinced that all the judgments that fell upon the Earth were the fault of these two men.
An in-depth study of the Book of Revelation. The Book of Revelation is a book of hope - that justice and salvation prevail. It’s also a book of warning - that justice (God’s justice) and salvation (God’s salvation through Jesus) prevail.