If I use this card's effect to play a Digimon, is it treated as a Security Digimon even in my battle area?

Can I play this Digimon with its [Security] effect even if it loses the battle against the attacking Digimon?

This card is flipped over during a security check, but the attacking Digimon still has security checks remaining. Is this card played off its [Security] effect first, or do I have to wait until my opponent finishes the rest of their security checks?