It would actually be much more efficient if for example the one in the party who deals the most damage without any enchants uses vorpal and other guys go plague & terror. Vorpal is not the only right answer.
The video of the full run is linked also. You can check there if you could tweak anything in your run. I don't think running past trash where it's possible could be called exploiting, but rather clever usage of game mechanics. But that is only my view and I understand some people do not agree with it. Anyways we kill…