Had a discussion in my last playnight about nightwatch card old bear mormont.
The player that controlled old bear said that he could put a card out from his hand after the challenge phase even if he was not challenged at all. I believe that you have to be challenged to use that trait.
The card says, when the challenge phase ends, if you have not lost a challenge as the defending player this phase, put a (night watch) card into play from your hand.
We went with that you could not do this after some discussion. Any info about this would be appreciated.