In the teacher panel that is shown once you have started a loop, there is a headline that says Teachers. There you will see your own name and Add +. This is where you add colleagues that you want to collaborate with in the loop.The colleague you invite will, just like you, be able to see all the answers the students hand in and provide feedback. This might be a good idea if there are specific students whose progress in your subject needs to be supervised by the teacher responsible for those particular students.
