I just had an idea and would like confirmation: putting cards into play from another player's hand doesn't count against Fear of Winter's limit, right?
Fear of Winter
Each player cannot play or put into play more than 1 card from his or her hand until you reveal a new plot card.
Breaking and Entering
Intrigue Gambit
Any attachment or location card that would be discarded from any player's hand as part of the claim of an challenge may be put into play by the winner of the challenge, under his or her control.