Just who in the Imperial Guard hierarchy can be shot by a commissar? Obviously regular infantry and officers, but what about company commanders? Colonels? Majors? Generals?
If a IG army HQ is overrun and the General himself turns to flee, can the commissar shoot him in the face? I guess what I'm asking is at what point would a commissar go too far? Would a Lord (or Lady) Commissar be able to shoot a planetary commander?