Can I just say that whatever your view of LL, IMO some if the expressions she used are of no significance. To watch like a hawk just means being extra vigilant. A student glued to her, babies looking rubbish/being angels/naughty/misbehaving etc., to me are just things you hear all the time. And on NNUs people say much worse things, trust me!
Some of the expressions may well be insignificant. Language is complicated, people may innocently say much worse things on NNUs all the time.
If a person is murdering, and escalating this behaviour, they will be stressed, trying not to be caught. They may be perceptive enough to realise that A/ things are getting out of control and B/ things are coming to an end.
If guilty, some of this conflict will be reflected in some aspects of a person’s behaviour, body language, linguistic choices.
MOO