YOU SAID:

The killer must have taken her by surprise while she was in the bathroom.

INTO JAPANESE

彼女がトイレにいる間、殺人者は彼女を驚かせたに違いない。

BACK INTO ENGLISH

The murderer must have surprised her while she was in the bathroom.

INTO JAPANESE

彼女がトイレにいる間、殺人者は彼女を驚かせたに違いない。

BACK INTO ENGLISH

The murderer must have surprised her while she was in the bathroom.