Pulverizing the wall is a simple matter, and it turned out that the walls were jam-packed full of big, twinkly gemstones as well. It gives the boulder you pick up from the debris a certain pizzazz that most of your usual caveman projectiles lacked. The Force Ghost doesn’t react when you launch it towards the tree, and it had every reason not to react, seeing how the whole boulder just collided with a pretty meaty invisible shield around it, crumbling to gravel that sank into the solid stone ground like quicksand.