I heard that this could have literally just been a fit of rage which he has been known for. He's "in" Hollywood he could literally have just loaded a firearm and shot her in cold blood because they can just get away with it. Would explain why his excuses don't make sense. Or this is literally some Agent 47 hitman shit where someone put a live round in a gun, or purposefully put a squib load in the barrel so a blank would send the blocked projectile out. None of this makes sense so I wouldn't put it past him to literally have shot her on purpose at this point, add in your speculation thats just another reason why someone would shoot someone.