Brunhild arrives quickly afterwards and Kriemhild reveals to her that it was Siegfried who defeated her both in Iceland and in her bedroom, thereby publicly confronting and insulting Brunhild. She proves her claims by showing Brunhild her former belt around her waist. This drives Brunhild over the edge.
After arriving swiftly, Brunhild learns from Kriemhild that Siegfried had triumphed over her in both Iceland and their private chambers, publicly shaming Brunhild. To prove her point, Kriemhild displays a belt she once wore around her waist. This action causes Brunhild to become enraged.