Are Attack/Defend triggers added to chains based on turn order, and is distributing damage a game action that should follow turn order?

Ruling: Combat showdown is an exception to the general turn order rule. The attacker puts their triggers on the chain first and gets priority/focus first, even though the general rule 503.2.a would suggest using turn order for simultaneous actions.

Sequence:

• Attacker puts "When I attack" triggers on the Initial Chain first
• Defender puts "When I defend" triggers on the Initial Chain second
• Attacker distributes damage first
• Defender distributes damage second

Nuances:

• Rule 625.1.c defines a specific order for combat triggers, which exempts it from the general simultaneous action rule 503.2.a
• The CRD will be updated to clarify this exception