Logic behind the concept of temporary enemies

[floder]

Planets in the 2nd, 3rd, 4th, 10th, 11th and 12th sign from a planet are considered "temporary friends" whereas planets in the same sign, 5th, 6th, 7th, 8th and 9th from a planet are considered "temporary enemies".

Some of this is counter-intuitive as you would expect planets in the 12th from a place to be an enemy and planets in the 5th and 9th to be a friend, purely from the nature of of those houses.

And also consider that Jupiter will only aspect it's temporary enemies through it's 5th and 9th special aspect, this also seems counter-intuitive.

What is the logic/reasoning behind considering these placements friendly or unfriendly and how does one reconcile this concept for instance with the fact that Jupiter only aspects it's temporary enemies?

[lefteye]

A good question which has no direct answers.
But the trines 5th and 9th have been mentioned in many references in transits to time the death like gulika-saturn or identifying maraka in Shoola dasa.
If you look into the longevity calculations in classics all these rules are applied while carrying our harana.