Horror Marks

[incognito]

Let's say you have a mage get horror marked by a spell/artifact/whatever. If that mage can cast enslave mind, can you subsequently enslave any horrors that show up to attack? If not, are there particularly good spells/bodyguards to use against attacking horrors?

On the same subject, what is the relative frequency of the different horror attacks? I'm guessing doom horrors are somewhat rare, but I'd be curious to learn what others have seen firsthand.