Scipio, I have seen blood pool like that - exactly like that. It takes a surprisingly short time to come to a halt and pool BTW. You are not convincing me, I am not being stubborn, you are simply wrong about this.
P.S. Please explain how blood got to the underside of her lower arm too.

By luck a colleague who is a MD not just a lawyer and has a lot of forensic experience was around.
His first comment is that the photos suck and we really need to see better photos of the other side. Today in an autopsy they would document the blood at all angles. Blood is visible on the top of the wrist and top of the palm but the photos do not show the lower side of the wrist or palm. He would want to see that and the trails before rendering any solid assessment.
You can only see a little of the trails on the outside of the arm and can't see whether they originate/end at the bottom of the hand or top.
His guess is that MacDonell was suggesting two things based on what he sees.
1) that the arm was moved up when both wounds were present and that would account for blood going down both sides.
2) that the arm was moved repeatedly and this resulted in the trail being "messed up" and looking like drips that ran to the wrist. The blood flowed down the the elbow then back up to wrist to an extent thus making the trails flow in different and odd directions and fatter than they would be otherwise.
Based on the limited information he suspects the blood leaked from both holes to different sides of the wrist and flowed towards the elbow then back down to an extent. He said that the information is not enough to say for sure that happened though you need to see all angles clearly.
He suspects there are other photos showing other angles. He said it is possible for blood to have leaked from the palm down the other side of the arm so it is not a sure thing that each wound ran down a different side. It is likely but there are other possibilities so we need to see every vantagepoint.
Even ignoring the drips on the other side he doubts that the flows I suggest ran to the wrist could result in so much blood as to leave the impression on the gown and still the blood on the wrist so disagress with me. He said I am being fooled by multiple motions.
He would also want to know more about the stain on the dress. If there was blood on the bottom outside of the hand and wrist not just the top then he would expect there to be some blood in the area where the outside touched the dress. Only a little of it would have touched probably so maybe just a small line but he would still expect something there.
He also said that for these things to happen she would have to be sitting up at the time. With her laying down and then wiping the blood on the arm it would not result in enough blood to drip that far in various spinters (her arm would be put down flat pretty soon afterwards) and instead there would be smearing would be all around the palm and wrist. We really need to see the inside of the palm and wrist to be able to figure out for sure what happened.
So he doesn't know why it was suggested that she was lying down. In his opinion the blood that leaked from the neck to the shoulder was leaking as she was sitting. The flow pattern is down not sideways aside from a few stray trails that went down the side of the shoulder while she was lying down. So he again doesn't understand why MacDonell suggested she was lying down when shot the change in direction indicates she was sitting then lying down.
Adam is SOL because he said she would have to be seated when the blood leaked onto her shoulder and arm not lying down which means she was not lying down when shot. But other experts already said that anyway including to the Appeal Court. She was shot while seated then moved flat later.
If the blood on the arms was from both wounds it means for sure someone else killed her because she could not have leaked the way it did onto her arm from both wounds. He suspects that is the case but unless shown the other side of her arms he can't say that for sure both wounds contributed.
The blood did not leak out of her mouth until after she was lying down and her head was moved in multiple directions. In his opinion someone moved her head after her death.
Something else he noted is that there is some spatter on her right arm but he doesn't see any on her left. Her left hand would have been up near the wounds had she fired the gun herself so the spatter should have been on that arm. The spatter tends to suggest her right arm was closer to the wounds than would be the case had she fired the shots. He would want to see good photos of her left arm because if there is no spatter then her left arm was at her side most likely and not holding the rifle or even sitting in her lap.
There are no good photos of June on the site for him to make any solid assessments based on photos other than that the blood on her dress means she didn't just fall out of bed as I have suggested but she definitely was standing up and he agrees that blood on the pillow means the shot above her ear happened while she was in bed. The trajectory of the wound to her neck means she was sitting up in bed when shot. She was sitting up or standing when shot in the upper and lower chest.
His guess is she was shot above the right ear, the knee and forearm while lying down then as getting up was shot in the lower neck and shot in the chest either while getting up or after getting up and finally was shot between the eyes while out of bed because if shot in bed she would probably not have been able to stand. He suggested maybe Nevill tried to help her get up but she wound up collapsing before he could help get her out of the room. That could account for his left profile facing the killer.
He had no time to look at anything related to Nevill in detail.