Antimagic and Stone Alchemy reward on same character

[Dude]

Recently, my antimagic char got an alchemist escort (must have been 1.1.3 iirc). I selected to betray to Zigur and started moving out, then my computer froze and I had to reboot. After reloading, I didn't get the quest dialog again but the quest was in the journal. And when we reached the portal, I was able to pick up Stone Alchemy as a reward. I guess I shouldn't be able to use it (it's all spells), but I currently don't have a cat point open so I can't test any further. Still wanted to report as it might be of interest.