For all the happiness you wish for someone, someone else gets cursed with equal misery. That's how it works for magical girls and that's how it is for me... I was stupid. So stupid

Sayaka said before her soul gem cracked and released her grief seed, Sayaka had transformed into the witch, nothing of what makes Sayaka herself is left

the witch was a large humanoid being with a mermaid tail, medieval knight armor, a cape with a heart shaped collar, a metal face and a sword