It was a descent try, and you would have gotten away with it if I didn't have others looking out for me. I'd say you were fine in your rp, but you have to choose more carefully who you try and backstab. Dryzzel had friends in high places, because he was in a high place, though that didn't matter later :), Oh well. I'm not saying its not a great angle to play, I think you just chose poorly who to keep doing it to.

Dryz

PS if you had done it to one of my blades, I'd have just let him kill you. Which is a lot less than Anathema.