User blog comment:Alockwood1/Sir Daniel Fortesque Versus Samurai Jack/@comment-4978251-20150723230455/@comment-4392864-20150723231739

Actually, in this Scenario, Jack has been battling one group of undead after another, and thus mistakes Daniel, yet another armed undead skeleton creature, for the enemy, and thus tries to vanquish him.

As for the Battle to the Death part - you are right in that the fight probably won't end in Death, as Daniel isn't a killer of the Innocent, and Jack's Sword is unable to harm the innocent, although his other weapons aren't under the same restrictions.