About all this time traveling thingy, I'm only certain, that Geralt and Yen are baits for Ciri. I don't really think Wild Hunt has her due to two things: uno elfs would gone with full scale invasion and not bother with kidnapping villagers. Duo, they would not let Geralt and Yen free, cause they almost always means troubles.
Maybe you are right but.
Point uno could be explained that these are preliminary raids before the full invasion. (the king of the wild hunt sounds very confident that he is about to curbstomp the witcher world)
Punto numero dos: could be to show that he is a man of his word to ciri and make sure she doesnt escape since if she tries to escape they would go after yen and geralt. and remember the wild hunt have taken away their memories so they could have believed that they wouldnt be an issue.


