In 2v2 mode, can a defending player flash their unit out and have a teammate ride the wind in to defend during the same combat?

Ruling: No, during a combat, a player cannot move a unit to that location unless they already have a unit there. The combat is locked to only the two original combatants until it finishes.

Sequence:

• When combat begins, only the two players with units at that location can participate
• If one player moves all their units out during the combat, other players still cannot move units in
• The combat remains locked between the original two combatants

Nuances:

• This rule also prevents a player from moving back into a combat they originally participated in (in multiplayer games) if they've moved all their units out
• If a combat is pending due to an ongoing combat at another battlefield, once the defender leaves, it becomes a contested location (not a pending showdown), and then other players could move in
• When the game returns to neutral/open, a showdown will automatically begin at the contested location