Kobolds are either magical or harnessing the technologies of thousands of years later - and of a completely different world.
You can see the Kobold standing between the dark patch of ground and the small patch of missing grass, and he’s shooting at my knight - who is behind the house that has the fences and flowers, and also several hundred feet away.
This isn’t the first time I’ve seen the kobold archers do this - they stand back at huge distances and completely ignore line of sight rules. I’m not sure about the huge distances being a bug but I’m pretty sure the LoS thing is.
PS: For those of you confused on the title, the ISU-152 was a Soviet heavy tank destroyer and self-propelled heavy assault gun that fired a 152mm shell, used during World War II. Aside from armor-piercing and high-explosive rounds, the ISU also used the 53-G-530 and 53-G-545 ammunition which could pierce through one meter of reinforced concrete at upwards of 400 feet.