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If a card with a side battle ability is negated during the side battle, then all interruptable effects that resultedfrom cards played during the side battle are likewise negated. Once the side battle completes, all effects thatconcluded in that side battle cannot be interrupted or negated, as they can only be interrupted or negated in thephase in which they were played.
Interrupting an ability only undoes the completion of that ability's activation. It does not undo the beginning of the ability's activation or the declaration of targets for the ability. The interrupted abilities go back to being pending abilities until they reactivate.
Interrupting an ability only undoes the completion of that ability's activation. It does not undo the beginning of the ability's activation or the declaration of targets for the ability.