In the middle of the episode, Mozenrath grabs Xerxes around the middle with his gloved hand. However, in the next frame which is a zoomed-in shot of Xerxes, the hand wrapped around the eel's middle is not Mozenrath's gloved hand, but his other 'normal' hand. It stays this way until the end of the scene.
Well, the appearance of what was under Mozenrath's glove was very brief in Black Sand, so there's a chance Al didn't get a good enough look at it like he does in this episode.
Mozenrath's magic gauntlet was removed in "Black Sand".
(After seeing millions more statues)
Mozenrath: Shamas must have quite the sense of humor...
In this episode we find out whats under Mozenrath's magical glove.