J'ai retrouvé mon SE rulebook :
C. REQUIRED TARGETING
An action may have a number of targets mentioned in its constraints
or effects, using the word “target”; for example, “Target one of your Holdings” or “Bow a target Samurai with less than 3 Force.” After announcing the action, you must choose
all targets mentioned in the action, in the order they are mentioned.
Exception: Targeting mentioned in the effects block is not required at this time if it: is done by another player; is delayed in time (for example, “Before this turn ends, target…”):
or is optional (for example, “You may target …”). These kinds of targeting are done as effects resolve.
Donc le premier targeting des effets est obligatoire mais le second est optionnel. Pour pouvoir jouer l'action tu dois avoir une cible légale pour le premier effet.
Mais je peux me tromper