User blog comment:DementedP/Isayama's take on Episode 23/@comment-11533966-20130917161241

Maybe that laugh is just her sadistic nature coming to surface? I mean, the other undercover Titan Shifters (whose names I won't say out of respect for those who haven't catched up with the manga) don't seem proud of their actions, but Annie rather enjoyed killing the Recon Scouts.