After Jacob took his family across the river, he came back alone, and a man wrestled with him till daybreak. Jacob came back because he forgot some small vessels.
The soul of a righteous consists of 248 parts, each part of his soul containing numerous sparks of many other righteous souls. Anything that comes to a righteous in this world comes not only for him, but also for the numerous sparks of other souls that are contained in him. This is why righteous love their possessions. And this is why Jacob came back for the small vessels, for if he did not, it would look as if he does not want them – but instead he needed to show that he loved them too. It was this cup with oil that the Maccabees found on Hanukkah.
Dina was a reincarnation of Eve, both representing the Supernal Kingdom. For this reason Eve was so much desired by the Primeval Snake. In parallel, Dina was abducted by Shechem, a Hivite prince – Hivia meaning snake in Aramaic. Shechem also had in him a spark of Adam the first man, after the Good fell into the kingdom of Evil. This is another reason why Shechem's soul “...cleaved to Dina...”. After Shechem was circumcised, his correction was achieved, the purpose in life completed, and he was killed.
Art: Rembrandt Van Rijn - Jacob Wrestling with the Angel