"L-3: The driver that is being lapped should let the lead driver past and/or not resist to be overtaken. Only move out of the way for the lead driver when you believe it is safe to do so. For example, not on the apex of a corner."
You've bolded the wrong lines. No car should move out of the way when being lapped. But the problem is that many of the lower class drivers take the "
it is responsibility of the lapping car to make the move safely" too literately and they usually just take the racing line without consideration for the lapping car.
Simply, if you race a car of your own class and he goes along side of you, would you turn into him? Just apply the same rules while being lapped. The only difference is the speed of the lapping car, but that has to be taken in consideration.
When you enter a corner on the inside, for example, and there is a car to lap you - stay on the inside until being lapped. Don't change the line to the outside even if the racing line now moves on the outside. Wait until been lapped (which happens fast) and then continue racing. The same happens when you are on the outside. That's all. Really no big philosophy there and both cars would loose just a tiny bit of time.
So:
1. Don't "jump out of the way"
2. Stay on your line until been lapped
In this particular case, Predrag carried a bit too much speed into the corner and mustangman was too tight into it. A bit of throttle release from Predrag and a bit of line change from mustangman and there would've been no accident. But, given that he was racing his team mate, I guess he couldn't concentrate well on both sides. But "idiot" ...