If this card's [Security] effect gives <De-Digivolve 1> to my opponent's attacking Digimon, does the battle with the Security Digimon occur with my opponent's Digimon before or after <De-Digivolve 1>?
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Official Ruling
It occurs with your opponent's Digimon after <De-Digivolve 1>. Security effects have top priority and activate when a card is flipped over for a security check.