"A helper? Witches sure take their jobs quite seriously ... I am barely alive right now".
"Shannon probably was in love with Battler for a long time, but didn't had the courage to tell him. From Gohda talk we know a female servant suddenly dissapeared saying. That was probably the old Yasu before becoming the Shannon we know. They kept their relationship as a "secret" but because of the problems with George, Battler parents knew of it, and they didn't approve it.
The motive for the murder is mixed. Battler family would never allow them to marry, they maybe even threatened Shannon.
Also, the letter talks about a sin. I think Shannon believe Asumu death is Rudolf fault, and want to kill him for the pain her dead caused to Battler".