In a showdown, if both players pass on playing action cards during the action phase, can they still play reactions before the showdown ends?

Ruling: If both players pass during the action phase of a showdown, the showdown ends. However, you can play a reaction to start a chain anytime you could normally play a reaction.

Nuances:

• Both the attacker's and defender's action plays can be reacted to during the action phase
• Reactions can be played at any valid reaction timing to start a chain