Katie died before Sophie could complete the spell.

凯蒂在索菲完成咒语前死了。

" Collo—" began Hermione, but before she could complete the spell the door had burst open again, and the two Death Eaters had come hurtling inside.

“快快——” 赫敏开口说，但没等她念完咒语，门就被撞开了，那两个食死徒冲了进来。