5 official rulings from Bandai, last ruled Jun 28, 2024. Straight answers to how this card actually resolves.

When an opponent's Digimon attacks, can this card's inherited effect end the attack before <When Attacking> effects activate?
No. This effect activates upon the counter timing after <When Attacking> effects have already activated.
Ruled Jun 28, 2024
When an opponent's Digimon attacks, if this card's inherited effect activates after comparing DP for the battle, can it end the attack at that timing?
No. After the battle is resolved, the timing for activation of effects during the counter timing has already passed, so the effect can't activate.
Ruled Jun 28, 2024
When this card’s inherited effect activates, is an attack considered to have never occurred?
No. The attack is considered to occur, therefore processing such as <When Attacking> effects is still performed.
Ruled Jun 28, 2024
Can I use to digivolve my Digimon if I activate this card's inherited effect and end the attack from an opponent's Digimon?
No, you can't. is performed at the end of the counter timing. If you activate this card's <Opp Turn> effect, the attack will end before <Counter> effects trigger during the counter timing, therefore can no longer be performed.
Ruled Jun 28, 2024
Do <End Of Attack> effects activate if I activate this card's inherited effect and end the attack from an opponent's Digimon?
Yes, it activates.
Ruled Jun 28, 2024
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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.