With. Note the alternation of four lines. Another pointing of the second line given in Septuagint is, chamor chamartlm = "destroying. destroyed them", which by Figure of speech Polyptoton (App-6). I utterly destroyed them. There is also the Figure of speech Antanaclasis in the words chamor, "ass", and "destroyed".
Related Commentaries of Judges 15:16
Judges 15:16
16 And Samson said, With the jawbone of an ass, heaps upon heaps, with the jaw of an ass have I slain a thousand men.