Funny trigger stance for a suicide....but I once remember seeing a TV show where the prosecutor said it is impossible for a person with a big revolver to shoot themselves in the center forehead without using the thumbs because holding the revolver any other way would be next to impossible. He neglected to think about one holding the revolver normally and then bringing it up, upside down to the forehead ——perfectly ergonomically possible and actually the easiest way.
That’s a morbid area of thought. But all he would have had to do was to take a realistically proportioned toy pistol and try it. I’d think it could as easily end up sideways.