Effect
When your opponent Special Summons a monster(s) from the Extra Deck (except during the Damage Step): You can Special Summon this card from your hand. If you do, this card is unaffected by monster effects that target this card.
The monster effect of "Retaliating "C"" is a Trigger Effect that activates in the hand.
It does not target.
It cannot be activated during the Damage Step.
The monster effect of "Retaliating "C"" is treated as finishing its resolution when the Special Summon is performed. ("Retaliating "C"" is Special Summoned while the effect "unaffected by other card effects that target this card" is applied.)
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