The guy dieing has dragon claws on, they don't affect defense or prayer..
Edit:
http://www.youtube.com/watch?v=1c_fnESncJk
He's kicking 27s... Something to do with this? Also, I think I have an idea how this works. It's similar to that old glitch where you could train strength with a whip, I think..
I'll post back when I find out more.