Ahh I see now. What DoctorStrongbad is saying is when you first look at the piece, it seems like the the victim is stabbing HIMSELF in the neck, which is slightly confusing. That's actually what I thought was going on too when I first looked.
After reading your reply to him and taking another, better look I can see that there is actually someone on top of him doing the stabbing, and there is a hand around his neck. I honestly don't know what I though it was before, but yea, basically you have to stop and look closer, and not just skim the drawing, or else it looks confusing.