Weiss' Summoning Glyph doesn't fail as she expected but works as she hoped. And what she summons is not what she expected, nor hoped for. But she could hardly complain. She did get the summoning to work and what she summoned might be greater than any Grimm Avatar she'd hope to summon.

As the flames around her died, she looked upon the person in front of her for the last time. She felt herself slipping, and after a tear, her azure eyes were covered by darkness, and when they opened, a golden hue replaced them. forever.