How many actions and reactions can be played in a chain, and how does priority/focus work during showdowns?

Ruling: You can play multiple actions during a showdown by alternating focus - after a chain resolves, if your opponent passes focus and does nothing, you can play another action. You can play multiple reactions in succession by holding priority, but you cannot respond to an action with another action.

Sequence:

• Player plays an action (starts a chain)
• Opponent gets priority to react
• If opponent passes, chain resolves
• Focus returns to original player
• Player can start a new chain with another action
• Showdown only ends when both players pass on an empty chain

For reactions:

• You can hold priority after playing a reaction to play additional reactions
• Priority to play reactions only passes manually
• You can react to your own cards to retain priority

Nuances:

• You can never react to a chain with an action - the whole chain must resolve first
• You can only play actions when you have focus or on your turn
• Focus automatically passes to the opponent when a chain ends