Bruce noted the lack of pursuing footsteps behind him, and sensed that Ross had been slowed more by the pillars than he'd anticipated. Briefly he considered changing course to sprint back toward the Gaian while he was occupied, but chose instead to maintain his semblance of a plan. As he passed the granite slab still situated where Ross had left it, Bruce manipulated the earth beneath it such that the side his chain was now attached to rose up. Bruce lengthened the chain to connect to the dirt he'd earlier set up on the opposing wall, and then retracted it quickly to hoist the massive granite platform onto its side. 
Bruce brought back his mace, dissipated the chain, and, dictating the flow of Ki such that it thrummed at the outer edge of the weapon upon impact, sent it flying back toward Ross while he also brought a horizontal column of stone shooting out toward Bruce from behind him.