Does combat automatically end when one party no longer has any units?

Ruling: Combat does not automatically end when one party no longer has units. Combat continues until all relevant players consecutively pass, even in situations where one side has no units remaining.

Nuances:

• This applies even in open showdowns where one player's units are eliminated before combat steps begin
• A player can trigger and resolve abilities (like Yasuo's ability) that kill all opposing units, but combat will still continue until players pass