Dr. Okrand didn't clarify when {net X} would be used as opposed to {'e' Xlu'}, but acknowledged that multiple uses of {-lu'} in a complex sentence refer back to the same indefinite subject. In {Heghlu'DI' mobbe'lu'chugh QaQqu'Hegh wanI'}, the subject of {Hegh} is the same as the subject of {mobbe'}. (There are several other examples in canon, but this sentence happens to appear in the paq'batlh.) This seems to explain some instances of {'e' Xlu'} that we've seen, namely, {yInlu'taH 'e' bajnISlu'}, {yay chavlu' 'e' bajnISlu'}, and {DIvI' rojmab qep ghanglu' 'e' nIDlu'}. It would also seem to imply that {vImuHlu' net wuqHa'} means the person who commuted the execution is not the same as the person who performs the execution, whereas {vImuHlu' 'e' wuqHa'lu'} would imply they're the same person. But it does not explain {Qang QanmeH yan 'ISletlh Damuv 'e' wIvlu'} (rather than {net wIv}) or {SIS 'e' 'aqlu'} (rather than {SIS net 'aq}). -- De'vID