When I saw that you didn't save me, I put my life in my hand, and passed over against the children of Ammon, and Yahweh delivered them into my hand: why then are you come up to me this day, to fight against me?
When the Ephraimites had confronted Gideon, he responded with psychology (Judges 8:1-3). Jephthah was a different kind of person from Gideon, however. He responded with a sword. Jephthah was a nobody, and nobodies are often unimpressed with people who think they are somebodies, as the Ephraimites did.