The only thing i can think of, (not being a gun user) is that having the nozzle (or whatever it's called) right against the glass like that makes it impossible for the bullet to gain any "play" against the slick surface of the glass?

But the pellets (shotguns shoot like 100 BBs all at once called a shell cartridge, rather than a bullet) have already travelled the full length of the barrel of the gun, so they're already at max speed.

I guess it's possible the shallow angle of the front window caused them to bounce and reflect downward in to the dashboard... but seems very weird and unlikely. And probably would've also maybe messed up the electronics in his dashboard to take several gun shots like that. I don't even see what he was shooting at. Just seems weird.

Here's a video of a cop shooting through his windshield, 8 seconds in, the bullets pass right through and the windshield cracks: https://www.youtube.com/watch?v=1EnuL92vAG8

That's even a small handgun, a shotgun is more powerful than that.

Maybe the guy had a bulletproof front windshield installed and was shooting it for "fun" out of impatience. But it did seem like was trying to aim at something when he shot.

I am still super confused.