Hi!
Sorry for so stupid question, but we argue with friend, and both of us think he is absolutely right.
Player A plays tactical card, for example, "destroy target ally". This card goes to the chain.
Player B plays action of that ally, for example, "tap this ally to deal one damage to target ally". This action goes to the chain.
Player A plays tactical card, for example, another "destroy target ally", targeting same ally as at first time.
Can players play cards/actions this way? Or every action/tactical card must resolve first, and only then another player can play action/tactical cards?