W-well... it turns out that all this time, Kyubey's been lying to us! In my timeline, Sayaka-chan contracted too, and -- and she used too much o-of her magic without c-cleansing her soul gem, a-and then -- th-the witches are us, Sumimura-san! When a magical girl r-runs out of magic, o-or she has too many negative emotions, she t-turns into a witch, and Homura-chan tried to warn us but Sayaka-chan -- sh-she bec-came a witch!