In english, saying "Tim and Bob fought." Implies that they fought each other
It does not imply that in Klingon. Suv qeylIS molor je says Kahless and Molor fight (someone unspecified). Now, it's true that if Kahless and Molor fight each other, then Suv qeylIS molor je, but the sentence in no way implies that they are fighting each other, only that they are fighting someone. The Klingon Suv qeylIS molor je does not necessarily imply that the two fight on the same side, but it doesn't preclude it either.