The voice didn't pause between any of its commands. The moment William finished the tests, he was immediately asked to retrieve his Signature ID card.
From the look of things, William didn't really have a choice whether to listen to the commands, since running away now would be very suspicious. He channeled a strand of his stored Spirit Qi into the card first, then followed it up by cutting off a small portion of his soul.
With a little help from the System, William figured out how to extract his mental strength, which now required him to manually force it out from his Sea of Consciousness. Before he Ascended, extracting mental strength was a simple matter, but a few steps were added since.
Lastly, William made use of the Weapon Sharpness Talent and a Starmetal Shortsword to draw a thin line across the wrist. Combined with his residual aura, the Signature ID card finally recorded William's information and the card disappeared into thin air.