ok, invoker forceduels me...

Firstly, I am not in the "invoker" frame of mind, because I've played 10 characters since my last invoker.

Secondly, I don't know which paths the invoker took. I might end up trying to iceneedle him when he didn't take cold path.

Thirdly, I don't know what items he has. There's no way I can effectively take stock of the stuff in my inventory and on my body, let alone that in my containers without him getting several extra spells off on me.

Fourthly, if it is an ap, say, he could wield a staff to start the forceduel, then flee and switch to axes. You probably won't realise you are using a bad weapon until too late.