It is strange puss - I have another strange story as well. My husband comes from a bgf family he was very close to an elder brother who died in a house fire at his grandparents house when the brother was 21 and my husband was 13.
It had been a habit of his brother, who worked early shifts, to hide in the hallway of their house for when my husband was due home from school and ambush him for a carry on.
On the night that his brother died, they got the news at 2 o'clock in the morning, when his Dad came up to tell the family the news, he could already hear my husband howling as he knew what had happened already.
The interesting part is what happened a couple of weeks later when my husband was back at school.
He came home one afternoon and out of knowhere his brother jumped on him, just like usual, and they had a rumpus in the hallway - until his Mum came out from the kitchen to see what all the noise was and my husband was standing there alone - obviously.
He knows that it must have been his grief, but he is adamant that he could feel, hear and smell his brother just the same as if he had been there. he also did not fully imagine it, as his mum heard the noise in the hallway. He has never had any other experience since, but he feels it was because he never got a chance to say goodbye.