Atticus then asks, "Then whose blanket is that?" Scout then becomes aware of the blanket across her shoulders. As Jem is remembering the events, he recalls that Mr. Radley was fighting the fire with the other men, which means he could not have been the one to cover Scout with the blanket.
I believe that peer is referring to someone else who goes over your paper or report and then puts checks next to things you need to work on or that you have done.
