He stood up and looked down at them, listening to Toph and trying to think. Think of something. Hmmn. He bit the inside of his lip as he formed the scenario in his mind, looking back to Toph. It was a gambit.

He took his club and etched into the ground.

"There's one of them right below this angle. Bend a rock at the top and drop it onto it." If falling from a height was enough to take it down, then maybe using gravity a blow like that would knock it out!