Situation:
-Melee game.
-Player A Baratneon has Fury of the Stag plot and is Active player.
-Player B Martell controls Arianne Martell (PotS) with Thirst for Blood attachment and 4 Power on her.
-Player A wins a Power challenge against Player B, and chooses Arianne Martell to take control of her.
-Next round Player B Martell plays Arianne Martell since he doesn't control her anymore.
-On the same round, Player C Stark wins a challenge in which Roose Bolton (DB) participated, and triggers his effect: "Response: After you win a challenge in which Roose Bolton participated, all players take control of each character they own currently in play."
What happens with Arianne Martell which controls Player A Baratheon?
Does she returns to Player B as a duplicate on current Arianne Martell he controls at that very moment?
Does she returns as main Arienne Martell and current Player's B Arianne Martell becomes a duplicate?
What happens with Power on returned Arianne Martell and Attachments on her?
I found this very interesting situation, and probably not so common situation as well.
Thanks in advance.