I wanted to respond to this as I've thought about it over the past few days.
When a semi-automatic firearm is actually fired, the process is quite violent, and the ejected casing is normally thrown to the right quite a distance, I've seen 5 feet away up to maybe 15 feet or so away and to the right.....Sometimes this event, in certain guns, will throw that ejected casing more forward of the shooter, sometimes more backwards and to the right, and sometimes, under circumstances, a shooter will take that casing to his/her face, or it'll fly over his/her head, or straight forward, or even down a shirt, which, by the way, burns because it's rather hot right after being fired.
Now, the entire process of ejection changes under a 'manual' racking of a gun, because it's not as violent of a process, it's slower, done by hand, and in this case, it's not a lightweight casing being ejected, rather the entire round, and it's heavier. This causes the round to behave differently when coming out of the gun, and it doesn't "fly" to the right like a casing would during live fire. Some times it just pops out to the right, or it may 'dribble' out and fall straight down, or sideways, or backwards.
So, my conclusion, as a firearms aficionado, AND, I've had this happen to me more than one time, an ejected round, or casing, can easily hit the shooter in the forehead, or land in a shirt pocket, or a jacket pocket. Now, I'm not sayin' this is what happened here, but I think it very possible.