Satan would cripple mankind (you will strike at his heel), but the Seed, Christ, would deliver the fatal blow (He will crush your head). – A.P. Ross
 Ross, A. P. (1985). Genesis. In J. F. Walvoord & R. B. Zuck (Eds.), The Bible Knowledge Commentary: An Exposition of the Scriptures (Vol. 1, p. 33). Wheaton, IL: Victor Books.