According to pre-trib evangelicals if Christians get raptured before the mark then why does Jesus say those who endure til the end will be saved?

In the Olivet Discourse, Jesus Christ says: >“But the one who endures to the end will be saved.” (Matthew 24 : 13) Many evangelical Christians believe in a pre-tribulation rapture, meaning believers will be caught up before the Great Tribulation begins and will thus avoid the persecution associated with the Mark of the Beast (Revelation 13). If that view is correct, then believers would not need to “endure” to the end of the Tribulation (or until the Mark is enforced) in order to be saved. If believers are raptured prior to the appearance of the Mark and the Tribulation, how is the “enduring” part satisfied in their theology?