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

If [Marcus Damon] is treated as a Digimon by this card's effect and then its DP is reduced to 0 by an effect, is it deleted?
Yes, it's deleted.
Ruled Mar 28, 2024
Can I return an opponent's Tamer to its owner's hand for this card's Burst Digivolve?
No, you can't. You can only return your own Tamer to the hand for Burst Digivolve.
Ruled Mar 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.