Thats the exploit in it..Unless I am mistakin' you can also spell steal from another mage. Like if u r dueling a friend. You have molten armor he has frost armor you can steal the frost armor and still have molten armor. That is just how spellsteal works. I am a warlock of course so I don't know but I do know that a mage stole fel armor from me and had both fel armor and molten armor.