Undrafted colonist firing

[Apophis]

When about 50 squirrels turned mad, one of my colonists was outside of my base. He managed to get back in, but a couple of squirrels followed him. While I was killing those squirrels with some of my colonists, another colonist (not drafted) suddenly fired his minigun towards the battle scene.
None of the squirrels were marked to be hunted, and when I clicked said colonist, it showed that he was 'eating a fine meal', instead of shooting.

Luckily, nobody was permanently damaged, but it still is a bit strange.

I am using the cannons and turrets mod, and have the blasting charges enabled, but none of that should affect colonist behaviour, right?