His gaze tracked the flare as it shot from the sandstorm within the barrier, a coy little smirk forming against his lips as he'd begun to see the students evolve a sense for their situation. With his palms interlocked at the fingers, his body remained sitting on the edge of the earth rampart as his sight once again glued itself to the storm. He couldn't see them visually but he could feel their very movements as if he himself were one with the earth they stood upon. He'd notice them grouped up, no doubt understanding that this was not a test of solo ability but their combined efforts as a group. For himself and himself only to hear there would be a personal chuckle about it all.
"Rocky edges but still sharp potential.."
He'd adjust his fingers, forming a simple hand seal which adjusted the composition of the earth in one spot and one spot only. The thinly dig out "X" marking originally struck by the young Uchiha and backed up by Sara would lose pieces of rock that fell from the edges of the marking as cracks, though few formed. Though all this was not something normal sight could see except to those who possessed some form of augmented vision or doujutsu. What caught his attention the most however was a newcomer scanning the outskirts of the wall, something that made his eyebrow peak as he initially wondered just who it was when the flare jogged his memory. His eye's widened at first before understanding the full nature of the situation.
"More polished than I thought..."
He would leave the reinforcement alone to discover that a section of the outside wall had shown signs of chipping and even a minute crack edging away from a center point. It was evident that the weak point had been created through continued attacks on one focal spot alone.