The natural reaction of a pretribber or a someone who flunked out of elementary English comprehension might be to ask "where", but "Where?" is irrelevant to Jesus' comments about false Christs. Jesus didn't mean there would be two specific places a false Christ would come from, but that wherever someone says Christ is, don't believe it. Besides, Jesus already said "where", as an illustration, the wilderness and the inner rooms. Luke didn't record the full quote, but Matthew did. And, in no book does anyone respond to Jesus' comment with "Where?". It's totally dishonest, but par for a pretribber, to pair two distance verses together as one thought, such as "Where?" to something half a chapter away.
Also, "here" means the place they are. No one there would need to ask where "here" is. In any case, the disciples would assume Jerusalem, but where doesn't matter. A false Christ isn't discerned by his location.
What's the brain damage in a prettriber's head that Jesus can talk about people being taken, but no one would ask Where?