Author: Kyria d'Oreyn
Apparently, he was a reckless fighter and left an opening in his left during fights.
(Reference: Knife of Dreams, Chapter 20)
"Ah, Kirkun, you never did guard your left the way you should. Even then, you need to outnumber them three or four times to be assured you won't go into their cookpots." (Bashere; Knife of Dreams, Chapter 20)