No it doesn't. If it's a mistake then it means he unintentionally killed her, which is manslaughter.
The problem is, how can firing four shots at someone, be seen as anything other than an attempt to kill them? Especially as he had experience and training in using firearms. He knew exactly how they worked, and knew exactly what damage those black talon rounds could do to a person, yet he willingly fired FOUR of them directly at a person.
It is absurd. Of course he had intent to kill.