Funny and amusing situations...

Well, I'm sure the map author himself (he's here too) will explain whether he did it and why. Most likely, these are "technical" troops only for testing the plot itself or the path's traversability (purely in a logistical sense) from beginning to end. There are two main ways to do this: either add such troops/heroes or use cheat codes. The latter is, of course, more tedious.
There are also the Cursed Armor for Mograine at the beginning of the 2nd week... :)