Since you seem to want my answer, I'll give it.

Valguarnera is right.

I've played enough hero thieves to know their strengths and weaknesses. Racking up 100+ kills and less than 20 deaths with Weldinstur (a battle rager svirfneblin thief) taugh me a whole lot about thief tactics. In my opinion this is where Ryfivin fell short. If you fight like a warrior, be prepared to die. If you fight like a thief, there is very little you can't kill. I did not watch Ryfivin very much, but when I did he played like a warrior, and didn't seem to know when to run away.

So long, and thanks for all the fish!