This question came up specifically in regards to Rhaegal: Reaction: After you win a challenge in which a single Stormborn character you control is participating, choose and stand a Stormborn character. (Limit once per phase.)
Now, does a challenge phase encompass all player's challenges, or does each player begin a new phase. In the rulebook, it looks like the challenges phase is all one phase, each player acting when they are the active player. But then, Rhaegal's limit of once per phase may as well be the less confusing once per turn (since challenges are only issued during the challenges phase.) This wasn't a long debate - we went with what seemed the rules, and treated the challenges phase as all one block, but I wanted to check and see if we got it right.
Thanks for any help.