Having spent the last eight hours on a 'test' game solely focused on 'the bear', I give up!! Only 3 potions (bear would have nothing to do with them). I believe I tried every combination of the 4 ingredients at the wizard's talbe and no new potion. Tried 'mental telepathy with the bear' - nothing there.
The only new thing I found was if either a child or adult is Angry, they can hit the bear like a punching bag (very sad to watch). So that's it for my hopeful theory. It might of been fun though. Oh well.