If Player A passes priority while maintaining focus during a showdown, can Player B play an action speed spell?

Ruling: When a player with focus and priority plays no actions or reactions, they pass both focus AND priority together, not just priority alone. Therefore, Player B receives both focus and priority, and can legally play an action speed spell if there is no open chain.

Nuances:

• You cannot pass priority while maintaining focus - they pass together when you take no action
• Action speed spells can only be played when there is no open chain