There’s a short story or a radio play in this. Intrigued by sfelizabeth’s post and the mystery of her disappearance, a poster on this board contacts the woman in the link to ask if she’s the one who wrote that. She’s a matter-of-fact doctor with no time for speculating on the origins of obscure phrases, so she misunderstands it as a message from a strange stalky type who is threatening to kill birds. She contacts the police, and then…
You take it from there. I’m no good at this sort of thing.