特地去看了下尼伯龙根之歌的梗概（wiki）大部分印证了我的猜想，电影中不合理之处都有了更合理的解释。其中最重要的是：Sigfried 当晚睡了 Brunhild，而 Hagen 为了保卫国王的荣誉而杀死 Sigfried。
However, on their wedding night, Brünhild suspects something is amiss with her situation, particularly suspecting Siegfried as a potential cause. Gunther attempts to sleep with her and, with her great strength, she easily ties him up and leaves him that way all night. After he tells Siegfried of this, Siegfried again offers his help, proposing that he slip into their chamber at night with his invisibility cloak and silently beat Brünhild into submission. Gunther agrees but says that Siegfried must not sleep with Brünhild. Siegfried slips into the room according to plan and after a difficult and violent struggle, an invisible Siegfried defeats Brünhild. Siegfried then takes her ring and belt, which are symbols of defloration. Here it is implied that Siegfried sleeps with Brünhild, despite Gunther's request. Afterwards, Brünhild no longer possesses her once-great strength and says she will no longer refuse Gunther. Siegfried gives the ring and belt to his own newly wed, Kriemhild, in Chapter 10.
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