What I notice about Kane is that he does a lot of walking. He's constantly moving forward, ignoring warnings about travelling through the swamps at night, climbing straight up mountains, charging through lines of slavers. He's very puritan about his forward momentum. The plots of the stories are quite minimal, the last one almost seeming like a vignette. It's the rich atmosphere and robust energy that makes Howards' writing so great. Kane seethes with fury at injustice and when captured, his hatred for his slaver captor is so potent that the sheikh physically recoils. Here is how tough he is:
Even when they had him stretched out and piled man-weight on him until he could no longer strike with fists or foot, his long lean fingers sank fiercely through a matted beard to lock about a corded throat in a grip that took the power of three strong men to break and left the victim gasping and green-faced.
When reading this, I really wonder how Howard's writing would have evolved had he not killed himself. He was a prodigious writer and had an imagination large even for the pulps. I suspect he would have kept on experimenting and done some really interesting work.