(30 years since I was at Leeming as an air ftaffic control assistant) .
It is always tragic that people fix on a course of action and die but surely a simple solution would have been if both aircraft had turned left even for a few seconds then they would have each headed away from the other? The problem was surely they were both heading for the same piece of airspace and they needed to just
not do that. A few seconds then back onto their headings with danger passed? Tell me why they couldnt have done that ? Isnt the decision to focus on the decent or climb rather than change heading the key factor here?