Vlad was perfectly aware of the effects that isolation and sleep deprivation could have on a human's mind, so he was prepared. The potion he was feeding the man would allow him to regain some focus and leave him in a highly susceptible state. It was a basic potion used for interrogation, not very powerful, and a strong will could easily resist its effects.
However, Vlad knew he did not need to worry about that since the man's mind should be on the brink of shattering, and the idea that he could pose any form of resistance was laughable.
As the potion went down the man's throat, a flash of light crossed his eyes, and he began to gain some clarity. He was confused as he looked around the room, seeing metallic walls covered in darkness and a small light illuminating a young man.
Vlad gave the man a few seconds to focus, using the A.I. Chip to monitor all his vital signs before speaking in a sharp and strong voice. "Identify yourself."