I think it’s just an example of what drugs can do to you. There were about 8 police officer sitting on top of this chap that had run amok on the Albert Memorial one Saturday afternoon. That was the only way they could restrain him as he had super strength due to being high on something.
The thing that bugs me is; you are a 54 year old single bloke out walking your dog with a mate… 41 year old swedish blond ( not unattractive btw) sees you and makes a fuss of your dog. She then asks if you know of a B&B and you invite her to stay at your flat instead.
Once at the flat her behaviour gets odder and odder - constantly getting up to look out of the window, snatching fags out of his friends mouth (and his) because they are ‘poisoned’ , generally acting paranoid to an extent where his mate leaves feeling very concerned about her.
Would you a) let her stay , no worries b) call the Police as soon as you can and get her out of there???
To be honest there is option c), let her stay hoping for some luurve action later on.