Personally I find one of the most awkward parts of peer editing is the position I am placed into as a peer responder. On one hand, I want to be hard on the paper, so that the instructor sees I know what I am talking about. On the other, I want to support my fellow student and let them know they are doing great. These warring motivations often cause a reviewer to overcompensate, either by being too nice and not giving good feedback or by being overly harsh. It is a hard line to walk, but there are specific tools that can be used to help maintain a neutral position and actually be more help for your peer.