Or HaChaim on Genesis 34:8/אור החיים על בראשית ל״ד:ח׳

1 וידבר חמור אתם לאמור, Chamor spoke to them, saying, etc. Perhaps the word לאמור here means that he was willing to pay damages due to the father of a virgin who has been raped or seduced. He may also have been willing to marry her if her father and brothers were willing. This is why he continued: "give her to him as a wife."

2On the other hand, maybe Chamor wanted to disclaim any responsibility to pay damages in accordance with Ketuvot 41 that when the rapist comes forward admitting "I have raped, or I have seduced the daughter of so and so", he is not required to pay the damages mentioned in the Torah. We have a rule that self-confessed sinners are free from financial penalties. The words לאמור שכם בני could be understood as "seeing that my son has freely admitted his guilt he is not subject to the penalty imposed on rapists." We should not understand this verse as testimony by the father that his son had committed a felony because under Noachide laws a father may testify against his son (Maimonides Hilchot Melachim chapter 9).