[She nodded, absently. Equally absently, the words came]

...It's not easy to kill people without leaving evidence in some way. You can wipe things down but it takes time to do it thoroughly. Most victims don't exactly stay still either and killing people isn't a clean process.

[Unconsciously, behind the block in her mind, she had an idea of how she would do it. Consciously, she simply thought]

The difficult thing is narrowing down motivations. Like, why them and why those particular ways.