If I pass focus during a showdown, then my opponent plays a card, do I get another opportunity to gain focus, or am I locked out for passing earlier?

Ruling: You get focus again after your opponent plays a card. Passing focus is not permanent - players pass focus back and forth until both players pass consecutively without playing any action/reaction cards.

Sequence:

• Player A passes focus
• Player B receives focus and plays a card
• Player A receives focus again and can choose to play a card or pass
• This continues until both players pass focus consecutively
• Then the showdown proceeds to cleanup

Nuances:

• Focus only exists during showdowns, not during other phases of the game
• Passing focus once does not lock you out of future focus opportunities in that showdown