"Luck is part of it. You know how rocks are all different shapes? Well you can see where they'll break or if they're strong enough to withstand more force." She picked up a rock from where the water rolled against the shore and held it up for Jax to see.

"This one for example. Will break. Watch." She threw it against a bolder, not particularly hard but with the force that you might throw a spear. A third of the rocks break off and Moana began looking for the pieces.

"If I can find it again. Their was a crack in it, like the way that it had grown was uneven. Here it is." She picked up the two pieces and held them where they had broken. "See?"