This is what Prof Knight said
"A. Can I say, leading up to that, that I was struck in this case by the fact that in all the other four shootings, the direction was downwards or horizontal. Sheila is the only shooting of the whole five where the bullets have gone upwards. Obviously one must put the gun under the chin with the butt down there at the bottom. For a third party to do this seems rather extraordinary. To shoot upwards through throat, because he would have to hold the gun under her neck when she is obviously upright because of the blood splashings. And although its not impossible, it seems a strange thing to happen. As I say it is the only death of the five where the wounds went down or straight through. So I think it would be difficult for someone else to do this without her objecting."