I got the three blocks in the burial chamber and placed them in the spell cue card thing and stopped the protection spell.
Quite a bit later I asked (I think) the molewoman what three hands meant and she told me it reversed the spell before, but somehow sam had known to put in three hands.
I felt like I'd taken an accidental shortcut somehow. Am guessing there were a few of these, given the difficulty in working in all possible pathways through the 3 reels. Was a bit disappointed with that though.
Anyone else come across any?