"My opponent's Digimon with <Security Attack +1> attacks me and 1 card is removed from my security stack by the security check.If I use this card's [Opponent's Turn] effect to <De-Digivolve X> that opponent's Digimon and it loses <Security Attack +1>, is the 2nd security check performed?"
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Official Ruling
No. If this card's effect causes <Security Attack +1> to be lost before the 2nd security check, it isn't performed.