I've been away from the game for a while, but have noticed this. In AH there's a big issue when colliding and one person getting knocked out of the sky, while the other player flies away without damage. Many people offer their reasons for this as, lag/internet connectivy and all.
It appears you have not spoken to anybody with a clue on how the collisions models work.
I have a pretty good track record on the "search", but I'm not going to re-read things from 3 years ago that involves this game now. That's kinda' pointless.
As far as the games go, I'm just basing it off of some simple things like Need For Speed Shift/GT-Legends/rFactor, etc.
My question is this. Why can't two people be in the same point and time. (give or take)
I've already heard all the 3-dimensional stuff.
Because they are not both in the same place at the same time. No juxtaposition involved.
In a 1 on 1 fight there are 4 planes.
2 on your Front End.
2 on your opponents Front End.
All you have to worry about are the two on your FE.
If the two on your FE touch you will collide.
If they do not then you won't.
Just because the 2 on your FE touch doesn't mean the 2 on your opponents FE touch.
Fight someone 1 on 1 and both film it.
Watch both films.
They are slightly different.
What you see on your FE as a collision your opponent can see as a near miss or vs. versa.
For example.
What you see.
What your opponent sees
Those are two pictures of the same two planes at the same point in time from both Front Ends.
(edit: the pics are not mine and all credit goes to the OP for them)