This happened to me a few days ago! I did part of the Gnasher's Head turn in (the tattered note) with my human-illusioned dark elf enchanter and the executioner appeared and started repeating that line.
Alla was kind of vague on whether there was any reward from following the executioner and watching McNeal die and the comments suggested he just pops when he dies. I waited a minute for the executioner to move and just assumed it was broken and would reset itself.
I guess it never actually reset.
Jon
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