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But the heat of the furnaces does hurt others, besides scorching the surrounding area and this makes it Asuric. That is how the basic difference exists in Agni as a Deva and Agni as an Asura. It is no wonder that those who live by this agni (of Samvarta) as though they are doing it as a sacrifice came to be called as Asur.
Ravana’s period comes closely after Parashurama’ period and Maruttas are mentioned in Mahabharata as people who had fled from the fury of Parashurama. This Marutta doing the sacrifice with Samvarta must have the one who started new life after Parashurama's time. The meeting with Ravana justifies this time period after Parashurama.
The hazards of fire as expressed in Munda’s myths perhaps made them shun fire in any form. They even shunned the sacrificial fire in their marriage ceremonies. In Vedic marriages, the couple go round the fire to take marriage oath. But in the marriage custom of Mundas, the bride goes round the bride groom for seven times with a pot of water. Water being given an important place in all the ceremonies and customs of Mundas seem to indicate a conscious decision to move away from fire related works and adopt water related customs, obviously with an intention to preserve water and have a cool environment in the neighbourhood of iron smelting Asurs.