In a showdown, are all actions and reactions played before anything resolves, or can actions be played, then something resolves, then more actions?

Ruling: Actions can only be played when there is nothing waiting to resolve. Showdowns consist of multiple chains, where each chain must fully resolve before new actions can be played.

Sequence:

• Showdown begins with a chain of attack/defend triggers (if any)
• Attacker gets focus first and may play an action/reaction to start a chain
• Players add reactions to build the chain while they have priority
• When both players pass priority, the next chain link resolves
• When the whole chain resolves, focus passes to the next player
• That player can optionally start a new chain with an action or reaction
• When both players pass focus without starting a chain, the showdown ends

Nuances:

• Showdowns can contain multiple separate chains
• Each chain must completely resolve before a new chain can begin
• Focus and priority are different: focus is the opportunity to start a new chain, priority is the opportunity to add to an existing chain