User blog comment:Thailog/New trailer for Season 2/@comment-99.243.240.173-20120423104245/@comment-77.103.194.46-20120424190207

Because Kent Nelson talked about his wife and called her a spitfire and said she never let him get away with anything. He says to KF soemthign to the effect of 'Find your own Spitfire like that - ' and is cut off. As he only really met Artemis and watched their interaction it is assumed that he meant Artemis. Hence the pairing being called Spitfire.