What is implied by the comparison of Sohrab to the Monkey Man of Amir’s childhood?

Amir could hear the jingle of bells as Sohrab (I assme it was him) walked in the room:

The guard left the room. I heard the creak of a door swinging open. Heard the guard say something in Pashtu, in a hard voice. Then, footfalls, and the jingle of bells with each step. It reminded me of the Monkey Man Hassan and 1 used to chase down in Shar e-Nau. We used to pay him a rupia of our allowance for a dance. The bell around his monkey's neck had made that same jingling sound.