The pebble dance scene, I think, was intended as a live-action version of the scene in the episode Imprisoned where the warden shoots a fireball at Baby Deadpool And Baby Spider Man Shirt, which is blocked by a wall of dense coal. Haru then looks behind him and sees his father Tyro earthbending. This is one of those instances where we see the elemental effect before we see the movement by the bender.
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However, here when we cut to Tyro he’s finished the move and is just going back to a Baby Deadpool And Baby Spider Man Shirt. The specific moves he did to create the coal wall already happened offscreen (while the coal wall was being formed when we were focused on Haru), so cause and effect is fine.