Shen Sui never expected that Vivian would blatantly set the puppet to cheat using Extraordinary powers during the duel.
Under normal duel rules, such behavior is certainly not allowed. Shen Sui has experienced similar dark games before.
However, even if someone actually used Extraordinary powers during a Life Card Duel, it was always against people; he'd never seen anyone use Extraordinary powers against the Life Cards themselves.
Not to mention manipulating the cards on the spot, even switching cards from the deck to one's hand seems impossible.
If the use of Extraordinary powers on Life Cards and decks isn't prohibited, then the Life Card Duel, the barrier against the Extraordinary Invasion in the real world, might become a tool for enabling wrongdoing.
After all, Life Card Masters in the real world don't possess any Extraordinary powers.
