One can explain based on the precise wording of the verse, "the sea fled at the presence of the God of Jacob" specifically, and this name hints at Jacob our forefather, whose bed was complete. When he feared that Joseph had died, he said, "For I will go down to my son mourning to Sheol" (Genesis 37:35). The Midrash Tanchuma (Vayeshev, Siman 10) interprets: "What does it mean 'mourning to Sheol'? Perhaps I will die the death of the wicked, in this world and the next, because the Holy One, blessed be He, promised me that I would have twelve tribes, and now one of them has died. Perhaps I have not merited them, and I will die in both worlds." This means that he had not completed the holy work of his life until he was informed that Joseph was still alive, and his spirit revived (Genesis 45:26-27).