Charles Ellicott Commentary Judges 15:7

"And Samson said unto them, If ye do after this manner, surely I will be avenged of you, and after that I will cease." — Judges 15:7 (ASV)

Though ye have done this. —The interpretation of these words is involved in the same obscurity as other details of the narrative. They may mean, “If you act in this way, then I will be avenged on you before I am finished;” and perhaps the verse implies, “as long as you avenge yourselves, I mean to retaliate.”