In a free-for-all game, when a player moves to an open battlefield triggering an open showdown, can another player use an action (like Blast of Power) to target a different player than the one who moved?

Ruling: Yes, during an open showdown triggered by a player's move, other players can play actions that target any player at any battlefield. Combat/showdowns do not limit what can or can't be targeted.

Sequence:

• A player moves to an open battlefield with a unit, triggering an open showdown
• Focus passes between players in turn order, starting with the attacker
• When a player receives focus, they can play actions targeting units at any battlefield