The Death Threat Paradox

Students A and B were working together on a project recently. The project was a bit behind schedule, and Student B had still not arrived in class. Student A proceeded to say "I'm gonna kill her if she doesn't show up!" Think about that. It makes about as much sense as the classic "Raise your hand if you're not here." Wow.

DISCLAIMER (I've been into disclaimers lately; what can I say, they're fun XD) : Student A was obviously kidding. I don't want any of you running to the counselors with this, OK?