I'm a little (very) new to this, so I hope I'm doing it right. Please correct me if I've made a mistake.
So, I forget where, but at some point, it's mentioned that shard blades first cut and kill the cognitive body, the mind, and can then cut flesh. However, aren't all of the fused spren? Kaladin hears the men at Kholinar say that the fused fear Azure's shardblade, and he kills one as well, however, if the fused are permanently killed with a shardblade, how many were there originally? I assume this is not a correct idea, but how does the shardblade-spren actually work? Does the shardblade not kill spren on the cognitive side?