For their rock. — Perhaps this may be taken, For their rock (the enemies’ God) is not as our Rock (Jehovah), and yet our enemies are judges, i.e., lords, over us. So Rashi takes it. The verse should be read as a parenthesis. The argument would be this: No cause can be found for the defeat of Israel except the displeasure of Jehovah. The enemies have no gods that could fight against Israel.
The word for judges occurs only in Exodus 21:22; Job 31:11. The phrase “our enemies themselves being judges” (of the question) is more like Latin than Hebrew, but it may be correct.