Rule 370.1.a.2

An event can occur simultaneously with other events only when those events are all the result of the same Game Action or change in state occurring. Example: A spell reads in part “Kill up to two units at battlefields.” When that spell resolves, the units targeted are killed simultaneously because their deaths result from the same game action. Example: A spell reads in part “Kill a friendly unit. If you do, kill an enemy unit with no more Might than it.” When that spell resolves, the units are not killed simultaneously. There are two kill game actions being performed in the instructions of the spell. The friendly unit is killed first, followed by the enemy unit.