When I activate this card's [When Attacking] effect and my opponent's Digimon would leave the battle area due to processing the 1st part, an immediate-type effect such as "when [...] would leave" removes this card from the battle area.After that, can I process the part of the effect following after "then" in this card's effect?
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No, you cannot.As this card has left the battle area, it doesn't have digivolution cards whose colors could be determined. Thus, the effect cannot be processed.
Source: EX12-076 Susanoomon