I saw some guy with a gun in his holster at walmart but I didn't assume nor jump to conclusions that he was going to pull it out and shoot me with it.
The guy in the video had a GUN IN HIS HAND!
We don't know that from the video. If he's walking backwards towards the camera you can't see the gun in his hand.
That being said, they did find a gun with his fingerprints on it, and there is the picture.
Too early to call yet. Let the police handle this.