They are unfortunately in short supply of ponies who happen to be experts on talking about friendship, so they make do with polymorphic sentient rocks...who are decidedly NOT experts on talking about friendship.
That "Enslaved me" line makes me question something.
Technically, he convinced her to join with that roll. Now, he essentially did so by asking pretty please with the force of the dice on his side, but she's the "traitor" as technically, she would have willingly went with Steven.
Agreed, he didn’t really enslave her. Just seemed funny as I was typing it so went with it.
I really hope the rain scenes still happen