Taking Firstborn Status
When the forces of evil attack a person and he fights back, not only is he able to recover the energy they stole from him, he is able to extract energy that was buried deep inside of them from what they had previously captured. Therefore when Yaakov battled the damages of Esav he was able to extract from him even the status of Firstborn.
 Trickery of Yackov
Esav tried very hard to deceive his father with all his trickery and lies, until he would bring the supernal blessings upon him. Yackov was therefore forced to move against Esav in great trickery as well until he managed to snatch the blessings from him.
 Blessing of Esav
Esav's blessing of "on your sword you shall live" is the cause for the great lengthening of the exile.