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If a Fusion Monster is Special Summoned with "Magical Scientist", and attacks, you cannot choose to make the attack a direct attack on your Life Points, because the effect of "Magical Scientist" prohibiting this is mandatory, but the effect of "Astral Barrier" is optional.
(1) If your opponent's monster attacks a monster on your side of the field, you can make the attack a direct attack.
The (1) Trigger-like Effect is optional, it activates & resolves on the field.
This effect activates in Start of the Battle Step – Attack Declaration (like Mirror Force).
If Earthbound Spirit's Invitation is chained to Astral Barrier, Astral Barrier is applied. If Astral Barrier is chained to Earthbound Spirit's Invitation, Earthbound Spirit's Invitation is applied.
The effect of "Astral Barrier" does not target the attacking monster.