We learn from the Vedic Index: "In some passages the Panis definitely appear as mythological figures , demons who withhold the cows or waters of heav… - A. Berriedale Keith

Dasyu, a word of some- what doubtful origin, is in many passages of the Rigveda clearly applied to superhuman enemies... Dasa, like Dasyu, sometimes denotes enemies of a demoniac character in the Rigveda.

Nothing is more unsatisfactory than to attempt to define Indo-European society on the assumption that the Indo-Europeans knew only what can be ascribed to them on con- clusive evidence. Ex hypothesi, there were great dispersals of peoples from the original home, and those who wondered away were unquestionably constantly intermingling with other peoples . . . and it is not to be wondered at that in new surroundings new words were employed; still less can it be a matter of surprise that peoples which ceased to be in contact with natural features soon dropped the names which had become use- less.

It is certain ... that the Rigveda offers no assistance in determining the mode in which the Vedic Aryans entered India., .. If, as may be the case, the Aryan invaders of India entered by the western passes of the Hindu Kush and proceeded thence through the Punjab to the east, still that advance is not reflected in the Rigveda, the bulk at least of which seems to have been composed rather in the country round the Sarasvati river, south of the modern Ambala.