Sergei had stopped when he realized the figure on the ground was a prisoner, but the person noticed him and called out for help. He had no choice now; he had to keep his cover and help him. He went and kneeled by the man, inspecting the chain around his ankle. He said, "Let me search that guard's body for the key to this chain." Kneeling down beside the headless guard, Sergei grimaced as he dug his hands into the man's blood-covered pockets. Being careful not to be heard, he wispered, "I swear I'll avenge you as soon as I can."
After a few moments of searching he came a cross a key ring with a few keys on it. Bringing it back to the prisoner's foot, Sergei tried a few of the keys and unlocked the chain. He then offered to help the man to his feet, saying, "My name is Sergei. Are you hurt at all?"
He half hoped he was. The fewer able-bodied terrorists the better.