Meta Rule:162

If a card "cannot be defended" by a specific type of card then the opponent may not play any cards of that type during the defensive action of that attack (but cards which are already in play can be used). If a card "is not affected" by a specific type of card, then cards of that type may be used during the defensive action, but any cards already in play before the attack was made are considered not in play until the defensive action is resolved.