I have a Digimon that gained <Security Attack +1> from another card’s effect, and which also gained <Piercing> from this card’s inherited effect. I attack an opponent's Digimon with it, and perform a security check with <Piercing>. The first card checked has a <De-Digivolve 1> [Security] effect, which trashes the top card of my attacking Digimon, turning it into a Digimon without [Machine] or [Dragonkin]. This causes the Digimon to also lose <Piercing>. Do I still perform the second check?
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Official Ruling
Yes. <Piercing> has already activated. Perform the additional check, assuming your Digimon still has <Security Attack +1>.
