Why is Simon's dead body carried out to sea in terms of glorification?

Simon's burial at sea is done with a mystical fashion. The boys abandon him there, and the sea takes over the burial rights.

There are glowing sea creatures surrounding his body, the water cleanses or purifies him as the blood is washed away, and the tides sweep him out to the sea. The mysticism of the moment-a force we cannot see, takes care of the burial ritual.