A Merman cast a global Enchantment

[Narushima]

I'm playing a game against the I.A., playing Oceania. I cast three globals.
Then comes a battle, among others. I look at my units, don't remember why, certainly to see if they had afflictions, and I see that one of my mermen, a very basic unit, has the symbol "Global Enchantment" in its attributes.
Here's the culprit : http://img831.imageshack.us/img831/4...1803054860.jpg

The globals I had cast were "Wraht of the Sea", "Riches from Beneath" and "Lure of the deep". Here's a screenshot : http://img829.imageshack.us/img829/4...1803072081.jpg

So, seeing how the merman has the magic abilities of a flagellant, how is that possible ? Is it a bug ?