Popcorn's grandparents example is invalid.
1. It is a case of superbly positive love aspects dominating the charts.2. The charts are of Twin Flames. Only a Twin will die of grief when the other half dies. Nessus dynamic is never active in such cases.
3. Orbs are not mentioned. Nessus squares have minimal effect beyond 2 degrees in squares.
4. The family of Centaurs was discovered after 1977 and Nessus was discovered after 1993. The negative effect of Archetype Themes in celestial objects magnifies only after its actual discovery and naming. This is why the world saw very few cases of planned, serial killing by individuals prior to 1977. Nessus was not effectively manifest in its dark side till the discovery of Chiron activated Centaurs in every chart.
Documented evidence shows Bundy, Rader, Fred West, Dahmler, Chikatilo and Javed Igbal went berserk after 1977 [Bundy, West and Rader did commit some murders from 1974 but intensified after 1977]. Chikatilo killed 53 innocents from 1978 even though he was older than Bundy. Iqbal killed over a 100 after 1977, mostly after 1993 when Nessus was named.
The Reality of Nessus is that when it afflicts personal planets with tight orbs AND if there are no powerful love aspects or positive trines in charts, it always manifests its ugly side.
Look at psycho Luka's chart in the main forum. Nessus conjunct Sun and Mercury square KARMA exact with no good soft aspects in his chart triggered his psychopathic impulses.
Same thing will happen in synastry and composite, as have already occurred in over a dozen real cases of clients and their friends across the world.
One has to be extremely careful about Nessus afflictions in synastry and composite. When there are no soft aspects, Nessus Affliction will create an intense desire to sexually abuse and even kill the victim. This is not a laughing matter but a fact seen from the chart of each and every serial killer in modern history.