In the vehemence of his rage against Jacob, Esau vowed that he would not slay him with bow and arrow, but would bite him dead with his mouth, and suck his blood. But he was doomed to bitter disappointment, for Jacob's neck turned as hard as ivory, and in his helpless fury Esau could but gnash his teeth. The two brothers were like the ram and the wolf. A wolf wanted to tear a ram in pieces, and the ram defended himself with his horns, striking them deep into the flesh of the wolf. Both began to howl, the wolf because he could not secure his prey, and the ram from fear that the wolf renew his attacks. Esau bawled because his teeth were hurt by the ivory-like flesh of Jacob's neck, and Jacob feared that his brother would make a second attempt to bite him.