OK, who ever wrote this slip up must not have liked the movie...cause obviously he doesn't know what a joke is. That is part of the movie...the guy didn't want to get killed so he made Cindy think he was hugging her in a diversion to put the sign on her back that said "Kill Her" cause he didn't want to get killed...rather her them him...don't you think.
It works either ways if you think about it. Usually people write "(kill, kick etc.) Me" then put them on whoever's backs but it also works with "Kill Her" because Buddy's telling the killer dude to kill her instead of him...or anyone else for that matter.