Actually only the souls of the saved go to heaven. The bodies stay behind, and without any clear cause of death they become feral animals that sublimate their previously-ennobled desire for human togetherness into a simple guttural desire to consume human flesh.

The rest of us unrepentant sinners are left conscious among this new sea of soulless flesh, to defend ourselves against their ravenous teeth.

The saved man does not live on bread alone. He also desires communion, and Jesus has left the building.