The pain was real, despite this being a recreation of his memories rather than the real world. However, it was nothing compared to the pain of what comes next.
As he fell to the ground, Scarman was already in front of him. The giant man landed a kick in Nikolai's stomach, and the pain made Nikolai scream until his voice was hoarse.
"Scream all you want, kid," Scarman grinned as he grabbed Nikolai's head. "No one can hear you," he gave a grin before striking him again. "Now, tell me where you hide your money."
It seems that Scarman thought they were hoarding money judging by how much they took, but they indeed had none. Nikolai tried to tell him, but the crook didn't believe him.
As he saw like the outsider of his memories, Nikolai could see everything happening while wondering how did he forget the face of a man who tormented him this much?