What is this Rule?

“Who is being so vicious? Ye Xiwen, escape quickly or this attack will kill you!” Ye Mo shouted promptly.

Ye Xiwen snorted as a cold look appeared on his face. His hands emitted rays of golden light, and tore apart that ‘Heavenly Sword Qi’.

“Who is this coward that attacks me from the shadows?” Ye Xiwen asked coldly, while his gaze was tightly fixed above the city wall.

Above the city wall, stood several disciples with the True Martial University’s emblem embroidered on their chests. They were releasing a murderous aura while looking towards Ye Xiwen, with rays of cold light flashing in their eyes.

“It was me, do you have any complaints?” Those disciples directly flew down from the top of the city wall. They were headed by a young man clad in a cyan robe. He looked very calm and confident, and had fairly handsome facial features. There was a divine look in his eyes. His oblique eyebrows stretched all the way to his temples, making him appear rather majestic.