Teen Tried as Adult: Is 20 Years Fair for Brass Knuckle Attack?

This brass knuckle clad individual decided to sucker punch another person in the face. Then once on the floor, he continued to strike him repeatedly. Just prior to this post, I was discussing how many people end up serving lengthy sentences for minor, nonviolent offenses.

Then you see a video like this, and a potential sentence of 20 years. I am genuinely curious what the public thinks on this one. I find this behavior deeply troubling. It is cowardly on multiple levels and clearly constitutes assault with a deadly weapon. This person deserves to be held accountable. He claims the victim provoked him, and regardless of whether or not that is true, this level of violence is not justified.

The question I keep coming back to is whether 20 years is a fair and proportionate sentence. This is without question a serious and vicious assault that warrants real consequences. But when you look at other cases where individuals caused significant harm and received far lighter sentences, it raises a legitimate question about consistency in sentencing.

To be clear, my instinct is to want this punished to the fullest extent of the law. I have no sympathy for this kind of cowardly attack. But I am also trying to approach this with reason and ask whether the sentence reflects fairness and consistency across cases. That is what I am after. What are your thoughts?