I was able to recreate this. if you go down the rr tracks and get to the rock cliff at Novodmitrovsk and align your self with the main road you can look down from there you see a pine tree and the rock cliff just behind it. there is a small patch that is dirt that stops at a rock a little down. if you get too close you will slide down the dirt and stop on the rock ledge. At this point if youi try to move you will be ejected into the air and killed. I did this in the next respawn and have not tried a third time.