Awakening of Evil

The third map is definitely hardcore, but only at the beginning and end; I completed it with almost no losses in the middle. Since there were no locks, I chose the starting education with the "Uncover Secret" perk and wizardry with the "Wisdom" perk, which helped a lot. Now, my main question about the game mechanics: I cast "Dominate," and my opponent casts "Vampirism" and removes the "Dominate" effect, and then I can't cast "Dominate" again. However, this doesn't happen to me; my opponent casts "Dominate," and I can't remove the charm, even though I have the "Remove Charm" spell. And if I cast "Vampirism," it doesn't get removed. What kind of abilities are these?