A very interesting topic! Assuming you believe the non-dying party, a shared "crossing over" experience is very compelling.
"One of the strangest type of near-death experiences (NDEs) involve people who are not near-death at all. However, because they are in close
proximity to a dying loved one, they often experience a portion of their NDE. Such experiences are called "shared death experiences" (SDEs). While
this type of phenomenon does not provide solid scientific evidence for the reality of out-of-body existence, they do provide excellent circumstantial
evidence - especially if more than two people are involved. The following information comes from some of the top near-death researchers on the subject
Here is an example from the above link:
In the Summer, 1996, edition of the Journal of Possible Paradigms, Issue 4, an unusual shared NDE is described by a woman named Sussanna Uballe. Here
she describes what happened:
"The experience of co-experiencing death is, I feel, much like a NDE. I did not have a near death experience, but did travel part way up the tunnel
with my husband as he left this dimension.
"On Memorial day (observed), May 27, 1979, I was five months pregnant with my son, Christopher. My husband and I rode bicycles and ran errands around
town, and it was a very hot day for Minneapolis. I lay down after dinner and was so exhausted that I could barely move. As my husband went to the
corner store about 8:00 to buy something for his lunch the next day, I fell into a very deep sleep.
"I dreamt that I was walking with my husband, Herb, up a dark and shady forest path. It was a heavily wooded path, which was enclosed by a thick
canopy of trees overhead. The path was slightly inclined, and at the crest of a hill I saw the sky, somewhat like the light at the end of a tunnel.
Herb and I had been in deep conversation, about what I could not tell, but I suppose we were reminiscing about our relationship. I felt our very
closeness and felt totally in love.
"He began to tell me about what it was like to die; at first filled with rage, pain, and frustration, and upset that the clerk didn't seem to
understand his pleas to call an ambulance, that he had been stabbed in the heart and needed help. He said that after a short while, which felt
interminable while he was experiencing it, he left his body and floated above it and saw the body below him, and felt detached from it, like it was
just a body. He was filled with peace and love. And he felt no pain.
"After telling me this, he then said that he had to go. His feet started to move very fast, and he began to leave me behind on the path. I told him
that I could do that too, and put some effort into "powering up" my feet to make them go super fast. I actually started to rev up and move along the
path quickly, and felt as if I was traveling up a tunnel of forest toward the sunlight at the top of the hill. As I began to keep pace with him he
said "NO!" in a very powerful voice, and I woke up in my bed, feeling hurt at being told no.
"I looked for him, to tell him about my dream. He wasn't there, and his side of the bed showed that he had not slept in the bed that night. It was
dawn. I began to get irritated, thinking that he must have gone off with some friends, and feeling upset at how irresponsible he was behaving. I went
to where we kept our bicycles, to see if his was there, and it wasn't. I was so angry that I broke the bicycle lock and chain off of my bicycle with
my bare hands, (he had taken both keys with him), and set off down the street toward the corner store. His bicycle was near the store, and a patrolman
was standing next to it. I asked him where my husband was, and why his bicycle was sitting there. He asked my name and address, and refused to tell me
anything more. He suggested that I go back home, and that someone would explain everything to me later. In about fifteen minutes a police officer and
a clergyman came by and told me that Herb had been killed the night before.
"The dream braced me for this news, and although I was in shock, I felt assured constantly that he was not in his body, and a comforting presence was
with me throughout the next few days of viewing the body, the funeral and other unpleasant business.
"Two days after the funeral, I was preparing for bed and contemplating suicide to join Herb, so that we could be together on the other side or in our
next phase of incarnation or whatever. I consciously thought a question, "Should I kill myself to join Herb, or stay here."
"I then went to bed. I was just falling asleep when I felt a presence by my right side, and looked to see Herb, naked and glowing with a soft,
beautiful white light. He looked beautiful and I felt filled with love and happiness to see him. He spoke mentally to me, and said, "This is our
son," indicating my womb, "Take good care of him." I had no question then about my purpose, and have tried to do the best possible job taking care
of my son ever since. It did not at all seem strange that he used the word "son", and, of course, although these were the days before ultrasound, I
did give birth to a boy." (Sussanna Uballe)"