Question is how a dead body can be transferred through enemy territories for PYD. Afrin has no link to Manbij. They used Euprates Shied area or regime conrolled area and how it's possible? This question's answer shows how they are able to transfer Usa-delivered weapons from Manbij to Afrin.
It is 150 km if you use the main road. You have to pass trough an area which is held by turkish military. It does not make sense.