Easter eggs in Heroes.

Here's a question about Heroes 5 - Tribes of the East. In the very last scenario, when the hero-mage received 4 Thunderbirds every week, after about 100 Thunderbirds, a vassal hero appeared, and the Thunderbirds started appearing with him. I had to drag them to myself, leaving him with some weak warrior. I'm curious about the appearance of this hero on the map – it's like a UFO from the movie "Mars Attacks!". Has anyone else experienced this? Or is it a joke by those who copied the disc, even though I bought a licensed copy? Or does anyone still have save files? Check it by getting the Thunderbirds over a hundred. If anyone knows, please explain. http://sww.spb.ru/swforum/index.php?act=Attach&type=post&id=2249