What is your position on the idea that the Watchers spoken of in Genesis were angels who literally interbred with human females and created a race of giants? Or, alternatively, that the giants were a separate, Cainite race? Genesis 6:4.
Here's what Ellicott says: "Heb., Nephilim, mentioned again in Numbers 13:33, and apparently a race of great physical strength and stature. Nothing is more probable than that, at a time when men lived for centuries, human vigour should also show itself in producing not merely individuals, but a race of more than ordinary height. They were apparently of the Cainite stock, and the text carefully distinguishes them from the offspring of the mixed marriages. The usual derivation of the name is from a root signifying to fall; but Lenormant (Origines de l’Histoire, p. 344) prefers pâlâ, which means “to be wonderful,” and compares the Assyrian naptű, “unique in size,” often found in the cuneiform inscriptions as the denomination of an ogre."
http://biblehub.com/commentaries/genesis/6-4.htm