After a showdown starts and the first action chain resolves, can players play another action and start a new chain, or does combat immediately resolve?

Ruling: After the first action chain resolves in a showdown, players can play another action and start a new chain before combat resolves.

Sequence:

• Attacker moves units into contested battlefield and starts showdown
• Attacker has priority and can play an action spell
• Defender can respond with actions/reactions
• Chain resolves
• Priority passes to defender who can play action/reaction spell or pass
• Combat does not immediately resolve after the first chain