Should ALL players discard their defense/attack cards when they draw a No Guard / Disarm card?
NO. Only the player who drew the card will discard either their attack or their defense cards.
What do we do if we ran out of cards on hand (due to discarding attack or defense cards?)
If a player completely ran out of cards to play, in their next turn, they must draw a card normally, and not play it, and on their next turn, they can either play the card they drew, or keep drawing more.
Can I use a reverse card on another reverse card?
Yes!
Do I replace my stolen card(s)?
No!
We ran out of cards to draw from. What do we do?
Take all discarded cards, separate the attack and defense cards and shuffle them. These are your new drawing piles.