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His mother, who knew him better them anyone else, did not see it coming.
Do we know that? She can't speak to that now, and failing to prevent it from happening doesn't mean she didn't, at least to some extent, fear for her own safety or for what might happen... I think it's fair to guess that she didn't see the scope and scale of what has happened coming, but did she fear for her own safety? Who knows, maybe not, but maybe she was too scared to act in case she was unable to get help and found herself worse off...

I am nodding to everything JonLaw is saying...