I suspect he looked at the photos of the blood and formed his conclusions. That was his expertise.
Everyone can see they are bloodstains and blood runs on Sheila's arm. Except you and Bill.
Re HLM, it's mentioned in Wilkes, across about four pages approximately between 308-312.
The thing is David, it's not just Sheila who had non-disclosed wounds. It's June and Nevill also. And didn't Terezon also complain regarding an originally withheld photo of Nevill's forearm?
What I think should be done by the defence / campaign team is to have nondescript diagrams drawn up of each adult, including Jeremy, with all none-bullet wounds indicated, for comparison. It is clear that there was a life or death struggle that night. Jeremy is unmarked. How would Sheila emerge from such carnage unmarked and without any traces of the other two adults?