"You can stay at my house tonight!"
Alice was genuinely scared. At first, she thought those two kids were harmless and innocuous.
But after William's description, it seemed terrifying.
Let's do some calculations.
Garen could easily kill her.
If Luna can kill Garen with one slap, then what about adding Erebus to the equation?
By that logic, Alice was as vulnerable as an ant in front of those two 'adorable' kids.
If she somehow angered them, she could indeed meet a grisly end.
"Just for tonight!" William was planning to go to the Turner's anyway.
Since Luna and Erebus were already living at Alice's house, for whatever reason, he intended to leave their handling to Alice.
If Alice mishandled the situation and ended up dying at their hands, that would be her own issue.
Even with William's extraordinary abilities, Alice needed to grow on her own.
Consider it a form of trial.
