Liu had impressed him…
It wasn't an easy technique by any measure. The hyena generated omnidirectional sound by its very nature through its anatomical design. Its throat projected sound in an area effect that covered everything equally. It was simultaneously the beast's greatest strength and most crippling weakness, massive power output but almost impossible to focus without the assistance of a creature like the bat to guide the waves.
Except Liu had somehow found a method earlier than Ren had expected, accomplishing it without outside assistance.
Perhaps he was using subtle mana control to channel the waves. Perhaps modulating the throat's vibration pattern in a manner that naturally converged on a focal point through acoustic physics. Perhaps simply engaging in tireless practice until mastering a technique that nobody else could teach him properly, being the bearer of the first Golden Banshee Hyena in history.
