Seeing as Chamor went out to speak with Yaakov, why did he end up speaking with his sons?
Ramban (to 34:13): Since the incident was so embarrassing to them they decided that it was better for their father not to have to speak about it, and that they should speak on his behalf.
Rashbam: In 34:7, the Torah tells us that, when Yaakov's sons heard about the incident, they returned home; and it was as they were on their way that Chamor met them and proceeded to speak with them.
Ha'amek Davar (to 34:6): Initially, Chamor was talking to Yaakov. The brothers came, and he spoke to all of them.
Why does the verse add the word, "Leimor"?
Ohr ha'Chayim #1: He intended to say that he is prepared to enforce the law of one who rapes a virgin - to pay the fine, shame, and blemish, and he is willing to marry her if her father and brothers 1 want - "give her"!
Ohr ha'Chayim #2: Perhaps Chamor intended to exempt Shechem from the fine, for he admits. 2
What is the source that it depends on her brothers' desire? And what is the source that he was willing to return Dinah if they request this? (PF)
Ohr ha'Chayim: Do not say that he is exempt because I (a relative) testify about him. A Ben Noach is killed through his father's testimony (Rambam Hilchos Melachim 9:14).
Why does Chamor use the term, "Chashekah (... b'Bitechem)"?
Malbim: Cheshek is unlike Ahavah. It is blind. Sometimes a great person desires a lowly girl, and even if she is ugly and blemished! 1
Ha'amek Davar: He desires her not due to lust, rather, because she is your daughter. He did not mention the Zenus, just for the future, to give her "Lo l'Ishah" - a normal marriage.
Why would Chamor say so? The Malbim said that Dinah was beautiful, and from a great family (refer to 34:3:151:1)! Perhaps Chamor hinted that he should not need to give so much for her. He was more frugal than Shechem, who offered 'whatever you want' for her (34:11,12). (PF)