With 5 minutes prep and the resources they have from Wolfram and Hart, they stomp him. They can grab one of those books that you ask a question and what you ask about appears, they ask for a spell and they cast it, he dies or whatever they want considering the range of spells they would have access to.
Now of course that is the easy way, but they still have untold resources to draw from even with only 5 minutes of prep.
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