Although I generally come here to escape work, I suppose I'm feeling frisky tonight. In my state (not New Mexico), allowing a case of manslaughter against the amorer to go to the jury would be reversible error by the trial judge. Here, on an indictment of manslaughter, the Defendant's oral motion for Judgment of Acquittal at the end of the state's case would be due to be granted. On the other hand, on a case against the shooter, I would expect the Defendant's motion for Judgment of Acquital to be denied. At this point, the Defendant (shooter) would put on his case in chief - although he certainly doesn't have to as he has no burden. At the conclusion of the Defendant's case and after all rebuttal testimony and closing arguments, I would expect a jury verdict of guilty to manslaughter.
In my state, with manslaughter being a Class B felony, the Defendant would be looking at a sentence of 2 to 20 years. Of course, sentences can be suspended, split, reverse split, or straight. The Defendant would also have 42 days to appeal his conviction. Also, in our country, there is a remarkable thing called jury nullification. What this means is that the jury can vote not guilty even if they believe the state has met its burden. In the event of this last scenario, the state has no right to appeal.