There's near-infinite wiggle room in even the most straightforward request because of definition flexibility.
Well, I wasn't writing it out the way I would expect Kemmler to actually word it, because a) that would be tedious, and b) the exact way to word it correctly would be dependent on the specific circumstances and likely the Nature of the specific being chosen.
But it would be something more like requiring that being to "kill [insert names of Senior Council members, senior Wardens, Blackstaff, etc. at that time], in such a way that no Einherjar, shades, ghosts, or other remnants deriving from them remain able to impede my actions; destroy the wards protecting the Hidden Halls of Edinburgh and kill all who are within them at the time you do so; complete these tasks as soon as is possible by using your utmost abilities; and do not harm, confine, or imprison me, in any way, mentally, physically, or spiritually, or act to limit or impede my actions."
There's probably some wiggle room left in this, but I'd expect Kemmler to spend serious time on this, not just 5 minutes, and use specific knowledge of the being/situation. And with Kemmler's knowledge, probably do it in Latin, which is likely less friendly to grammatical ambiguity.