The gun had a shell deflector. This made all the cases fly forward and not into the shooter.
I was present at Birdwell armoury be Barnsley when test firing of an exact duplicate .22 semi-automatic anshuzt rifle was test fired, using Eley .22lr subsonic hollow point ammunition, both with and without a 17 baffled Parker hale silencer was fitted to the gun! At the time of these test firings, the shooter was right handed. The rifle itself was a right handed designed weapon. When the shooter fired a round a corresponding brass cartridge case was ejected from the rifle, at a forward angle of between 45° /60° to the right hand side of the shooter - none of the ejected cartridge cases struck any part of the shooter firing the rifle on these occasions! This was because the right handed shooter used the fingers of his right hand at the trigger, with the left hand supporting the barrel of the gun and in directing it at a target! The rifle was held on the right hand side of the shooters body at shoulder height..
However, it was demonstrated tome what might happen again if a left handed shooter fired the same rifle with the fingers of their left hand at the trigger, and their extended right arm and right hand supporting and aiming the barrel of a right hand designed rifle - when this occurred the shooter used the fingers of their left hand at the trigger, and their extended right arm / right hand supporting the barrel and aiming it! The gun was held on the left hand side of the shooters body in the region of the left armpit / left shoulder!
In the latter instance the ejected spent cartridge cases frequently struck the exposed shooters lower right arm / right wrist area of the shooter, leaving feint bruising marks on that part of the shooters arm!
So you are mistaken when you say that because of a deflector which accompanies the ejection port that ejecting brass cartridge cases could not strike a shooter, which is only true in cases where a right handed shooter is firing a right handed design rifle, but when the same rifle is used and fired by a left handed shooter, the phenomena displayed on the lower part of Sheila Caffell's lower right arm / right wrist occurred!
These visible bloodstained markings / straition marks which are present on Sheila's owner right arm /right wrist are a unique phenomena, which only occurred when a left handed shooter fired a rifle such as the .22 semi-automatic anshuzt rifle, handling it differently than the way it is supposed to be handled safely!
Sheila Caffell definitely fired the rifle, those bloodstained straition marks were made on that unique part of her lower right arm / right wrist because she handled the weapon, fingers of left hand to trigger, extended right arm and right wrist supporting the barrel and aiming it! When she held the gun like this, the ejecting brass cartridge cases were flung against the lower part of her right arm and right wrist, because she held the rifle on the left side of her body at left shoulder height - the ejecting cartridge cases were flung forward and to the right due to the deflector you have spoken about, hence even more reason why Sheila's extended right arm, hand sustainable ed those impact marks...
With the ejection port and it's deflector on the right hand side of the rifle, it becomes clear that the anshuzt rifle was designed for use by a right handed shooter, fingers of right hand at trigger, left hand supporting and aiming the guns barrel, with the general position of the rifle being held on the right of the shooters body at right shoulder level...
