I have three cards out:
Roose Bolton: Response: After you win a challenge in which Roose Bolton participated, all players take control of each character they own currently in play.
Steelshanks Reserve: No attachments. During the challenge phase, the active player gains control of Steelshanks' Reserves.
The Dreadfort: Response: After you play or take control of a House Bolton character with STR 3 or higher, draw 1 card.
My opponent is first player, and has control of Steelshanks Reserve. I win a challenge on defense with Roose Bolton. I trigger his ability. Do I take control of Steelshanks Reserve for a moment? Long enough to trigger the Dreadfort and draw a card?