Ki'Nua walked through the narrow path, sandwiched between walls of the auction house. The narrow path wasn't a point of entry into the auction house. It was only for checking the identity of the individual and counting the money each person submitted.
Such narrow paths were situated upon every interval, barricaded by walls the height of a person, preventing others from seeing who travelled through which path. As the cycle rickshaws stopped right at the entrance of the narrow paths, the moment the person within stepped out, he/she would be hidden by the walls.
It was an elaborate setup to ensure the identity of everyone remained discrete. Typically, the guards would present a gown to everyone within their carriage itself. But upon seeing that Ki'Nua and Re'Kha were already dressed, they left them to proceed as-is into the narrow path.