i will preface this with i = hungover today, so forgive bad word choices etc.

here is my question...

what is the most common theory on when rand sent narishma to fetch callandor and narishma returns furious with rand, thinking rand left out how to diffuse one of his traps? is it that rand did forget to tell narishma something? that someone else added to the shields rand created, hoping to kill/injure rand when he returned for it? or do people think that lews therin was weaving the source through rand and rand didn't notice? whatever the trap was, it couldn't have been super complicated since narishma was able to escape from it as a dedicated/new channeler. so what happened? who laid the trap or was rand just being a bonehead?