Jiang Shu gazed at the card deeply embedded in the wall, trying to comprehend the internal mechanism of the two terms.
Normally, a card manipulated did not possess the damaging properties of a "knife", therefore they couldn't control Shadow Cutting; however, if it was a card spun out at high speed, it would be deemed capable of inflicting damage.
Only those capable of damage could trigger "Shadow Cutting".
Switching to reality, manipulating a card with intent was akin to controlling a card with silk thread in Magic, which meant, regardless of speed, it wouldn't be considered as having the ability to inflict damage in the logic of Deception; but a spinning flying card, just like in reality, had lethal power, thus could trigger the Derivative Entry "Shadow Cutting".
However...
Jiang Shu glanced at the card deeply stuck in the wall, trying to retrieve it through his mind.
It was somewhat strenuous.
So he chose to duplicate one and then directly took the duplicate.
Not right.