Um, I am not sure really how to suggest an edit so I am posting it here. In the page for the Stand it mentions the fact that it creates "illusions". I am curious as to if on the final page of chapter 4 would be due to him, as Dragona is shown not holding anything, but saying that they feel it in their hands.
Lava Rock Owner's Stand#Perception Manipulation I am not sure where I could embed the panel showing it off for proof.