I have also suffered intensely from anxiety for many years and there are certainly aspects of this case that correspond with extreme panic attack behaviour. But the chance of this happening to
all five members of a family at pretty much the same time must surely be infinitesimal. Only one other logical train of thought springs to mind: psychoactives. I think the family have somehow been poisoned - and not necessarily intentionally or by an external party. It could have been anything. Maybe it was their lunch? Mushroom tea ... blackberry sandwiches ...Pythonesque salmon mousse? Something either organic or chemical that they encountered, inhaled and/or consumed in the early stages of their journey. Pesticides from their farm, even? But exposure to
something with hallucinogenic properties would
absolutely explain their completely irrational behavior, both collectively and individually. People having very bad trip can very much act like they're in a movie where nothing makes any sort of believable sense. Just a thought.
P.S. Stupendously long-time lurker here. Thought I'd say hi
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Keep up the good work!