Does a showdown start if you move to an open battlefield with no enemy units, and can actions be played?

Ruling: Yes, a showdown occurs when moving to an open battlefield, but it is not a combat showdown so nothing related to combat can happen. Both players can play actions.

Sequence:

• The player who applied contested gets Focus first
• When their chain resolves completely, or if they pass Focus, their opponent gets Focus
• Focus passes back and forth until both players pass without starting a chain

Nuances:

• This is not a combat showdown, so combat-related effects cannot be used