Pleasant Surprise

It has been almost two years since Sam had to shoot Martouf/Lantash when they turned out to be zatarcs. One day the doorbell rings, and when Sam opens the door, she gets the surprise of her life. Outside Martouf/Lantash are standing, alive and well. How did this happen? Also, who is after them, and want to make sure they are actually dead this time? Sam/Martouf/Lantash