I am indeed a widow woman - It is very possible that the principal facts mentioned here were real, and that Joab found out a person whose circumstances bore a near resemblance to that which he wished to represent.

and they two

Genesis 4:8 And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother...

Exodus 2:13 And when he went out the second day, behold, two men of the Hebrews strove together: and he said to him that did the wrong...

Deuteronomy 22:26,17 But to the damsel you shall do nothing; there is in the damsel no sin worthy of death: for as when a man rises against his neighbor...

none to part [heb] no deliverer between

The Hebrew Sages and their Proverbs
[Sidenote: Role of the sages in Israel's life] In the days of Jeremiah and Ezekiel (Jer. xviii. 18; Ezek. vii. 26) three distinct classes of religious teachers were recognized by the people: the prophets, the priests, and the wise men or sages. From their lips and pens have come practically all the writings of the Old Testament. Of these three classes the wise men or sages are far less prominent or well known. They wrote no history of Israel, they preached no public sermons, nor do they appear …
Charles Foster Kent—The Origin & Permanent Value of the Old Testament