I think he's probably an idiot-hero type. He originally approached the camp with food and drink to try to share with the soldiers there. Some attempt at peace? But ended up beheading a captain and such. And he let some soldiers go before burning down a tower.

[ Honestly she thinks it's sort of dumb because leaving survivors meant he didn't get away clean.

Shijima is very much Unseelie, at her core. ]