When does Breath of Darkness Down Your Spine check if a piece is alone for the purpose of abducting it?

When does Breath of Darkness Down Your Spine check if a piece is alone for the purpose of abducting it?

Just before resolving the sentence with the Damage/Destroy instruction.
The "+" before Damage in Power thresholds (e.g., on "Accelerated Rot") is non-functional; that's a separate Damage instruction from the one in the main Power effect.