When I take control opponent's character with some powers, how to deal with these tokens? Belongs to me or return back to Throne Room (power pool). I can't find this answer in FAQ.

And another question. If I declare stealth to Greatjon Umber(S10), although my opponent can not declare him to defend, but can he use Greatjon Umber's ability "Challenges: Kneel Greatjon Umber to have him participate in the current military or power challenge as either the attacker or as the defender." at player action window which after the declare defender frame window, let him join the challenges? or not?

Rex Tan said:

1. They remain on the character and you count them towards your victory.

2. If Jon gets stealthed he cannot defend. However, you can always use his ability BEFORE Stealth applies, so he can join the challenge and then be stealthed (which changes nothing because Stealth doesn't remove him from the challenge).

Remember, there is an action window after attackers are declared but before Stealth kicks in and defenders are declared.