I'm going to have to disagree with a prequel.

John Wick is pretty much a generic action movie. However, what captured my imagination the most was the mysteriousness of John Wick himself. Here is a man with what looks like a rather normal life going on, and in the wake of his wife's death, his puppy is murdered and his car stolen in a break-in. He spends no time angsting over it, very calmly picks himself up and spends the next hour and a half executing a Roaring Rampage of Revenge the likes you might have expected from a certain Navy Seal on the internet.

Everything in the movie tries to sell you on the fact that John Wick is one bad dude. Anybody who's not Theon Greyjoy immediately turn a shade paler at the mention of Wick. He's the literal boogeyman. It seems a silly concept, like some cheesy monster Papa Felon concocted to scare the Jr. before bedtime. As the movie goes on, you start to see exactly why Wick is so pants-shittingly terrifying. Reeves' natural lack of expression is what really sells "Baba Yaga". The way he unceremoniously murders 76 people, without any hint of joy or even anger, transforms Mr. Anderson into what can best be described as a force of nature with a prejudice against Russian gangsters. The true beauty of Wick's onslaught is his ruthless efficiency. He kills. If he breaks anything, he broke it killing someone. You're not going to see Michael Bay explosions and messy sprayfire gunfights. Every little move Wick makes is a calculated action designed to rob the sorry bastard in front of him of life. I just love the way he executes Iosef at the end.

And then what does he do? He patches himself up, finds another dog and goes home. That's the entire movie. He's not celebrating, he's not haunted by all the men he just sent to hell, he doesn't even need to give much exposition on what's he's thinking. His character is so one-dimensional and focused on being badass and it only serves to accentuate his mysteriousness.

You know what? All of that absolutely sold me on the idea that Wick is "Baba Yaga". There's this myth that's never quite explained surrounding the guy, and after watching him massacre the men in his way, it's really easy to see how people are convinced Wick lives up to that myth. It makes John Wick stand out in a sea of action heroes. In a prequel that would certainly show John Wick being much more "human" (where he's got an agenda that's not as pure as unadulterated vengeance, where he doesn't have the competency that we see in the first movie), I think it would ruin the mystique behind the boogeyman.

TL;DR I'm high as fuck and John Wick is a natural disaster.