Why the Open Pit Needs Its Own Verse Beside the Ox

"If a man opens a pit" - I have only "a man"; from where do I include a woman, and so forth? Rabbi Yonatan says, and so forth. Rabbi Yitzchak says, and so forth. "If a man opens a pit" - why is this said? So that one should not say: I have a claim from logic. Since the pit is his property and the ox is his property, if you have learned that he is liable on account of his ox, he should not be liable on account of his pit, and so forth. Therefore the verse teaches, "or if he digs" - thus, because I did not prevail from logic, Scripture needed to bring it explicitly.