When multiple copies of this card are trashed from the security stack at the same time, does the "when this card is trashed from the security stack" effect on each of those cards trigger simultaneously?

Yes, they trigger simultaneously.

Can I process "then, if you have 2 or fewer security cards, place this card as your bottom security card" in this card's ＜Main Timing＞ effect even I don't perform "by trashing your top security card"?

No, you can't. If the "by trashing your top security card" condition isn't performed, the rest of the effect isn't processed. In this case, you can't process this effect unless you trash your top security card.

Dragon's Roar rulings (BT18-098)

2 official rulings from Bandai, last ruled Nov 1, 2024. Straight answers to how this card actually resolves.

Effect: When this card is trashed from the security stack, activate its [Security] effects.While you have a yellow [Data] or [Witchelny] trait Digimon, you can ignore this card's color requirements. [Main] By trashing your top security card, 1 of your opponent's Digimon gets -6000 DP until the end of their turn. Then, if you have 2 or fewer security cards, place this card as your bottom security card.
Security effect: [Security] Delete 1 of your opponent's Digimon with 6000 DP or less. Then, if you have 0 security cards, Recovery +1 (Deck)

Official Q&A

When multiple copies of this card are trashed from the security stack at the same time, does the "when this card is trashed from the security stack" effect on each of those cards trigger simultaneously?
Yes, they trigger simultaneously.
Ruled Nov 1, 2024
Can I process "then, if you have 2 or fewer security cards, place this card as your bottom security card" in this card's ＜Main Timing＞ effect even I don't perform "by trashing your top security card"?
No, you can't. If the "by trashing your top security card" condition isn't performed, the rest of the effect isn't processed. In this case, you can't process this effect unless you trash your top security card.
Ruled Nov 1, 2024

Got a line that uses Dragon's Roar? Map it in the builder and share it with a link.

Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.

Dragon's Roar rulings (BT18-098)

2 official rulings from Bandai, last ruled Nov 1, 2024. Straight answers to how this card actually resolves.

Effect: When this card is trashed from the security stack, activate its [Security] effects.While you have a yellow [Data] or [Witchelny] trait Digimon, you can ignore this card's color requirements. [Main] By trashing your top security card, 1 of your opponent's Digimon gets -6000 DP until the end of their turn. Then, if you have 2 or fewer security cards, place this card as your bottom security card.
Security effect: [Security] Delete 1 of your opponent's Digimon with 6000 DP or less. Then, if you have 0 security cards, Recovery +1 (Deck)

Official Q&A

When multiple copies of this card are trashed from the security stack at the same time, does the "when this card is trashed from the security stack" effect on each of those cards trigger simultaneously?
Yes, they trigger simultaneously.
Ruled Nov 1, 2024
Can I process "then, if you have 2 or fewer security cards, place this card as your bottom security card" in this card's ＜Main Timing＞ effect even I don't perform "by trashing your top security card"?
No, you can't. If the "by trashing your top security card" condition isn't performed, the rest of the effect isn't processed. In this case, you can't process this effect unless you trash your top security card.
Ruled Nov 1, 2024

Got a line that uses Dragon's Roar? Map it in the builder and share it with a link.