Kisaik could hear Nathan whispering from the darkness, and furrowed his brow. The soldier ought to have more faith that Kisaik knew what he was doing. Yet he couldn't blame the grizzled man his concern. This was quite unlike anything that Kisaik had EVER seen. Quite outside his experience with eggs, certainly, of all kinds too! He'd dealt with bird eggs, turtle eggs, all kinds. But he'd never seen whatever kind of creature these were formed from.
Nathan asked him to do something with his growy legs, and Kisaik had to shake his head. He was too weak to really trip anyone. As it was, he was a good fighter, but he got on by skill and speed. Strength never really factored into it. Yet, as he came into the midst of those eggs, a plan did begin to form. These Aukari, though they were near to their homeland, were intruders in the Heart of the World. Kisaik was guessing, but he'd wager that whatever beasts lie down there, judging by their reactions, weren't friendly to the aukari agents..
Kisaik didn't want to fight if he didn't have to, but he took U'frek's protection, and thus put his trust in the old salty god of the sea. He would stop these Aukari from finding what they were after. And to do so, he'd have to make his own intentions, and those of his group, clear to the creatures prowling in the darkness, and protecting their eggs.
So, He looked up at Nathan, over his shoulder, and nodded at him. He spoke to Nathan, just a short statement, before he'd do what he had to, "Soldier, be ready for a fight!"
This said, he opened his mouth, and tore a rupturing Roar through the air, challenging the Aukari and drawing their attention away from the eggs as he bounded over toward the tunnels. As he went along, his amplified voice called in a Clarion call to the creatures within the tunnels, beseeching them to come to the aid of their young. "Creatures of the Heart of the World!"
He shouted, for all to hear, "Come to the aid of your young! These Aukari seek to harm your territory, they trespass and plunder. No more! For I and my companions have come to your aid!"
Kisaik kissed his Orange Fairy ring for courage, and wrapped Vega's scarf around his neck as he bounded down the tunnels, seeking out the creatures that were lurking just beyond, and seemed to so terrify the Aukari. He would mount one of them, if he was able (Expert Mount and Expert Athletics), and with their strength dash the Aukari contingent between a vice maneuver of his companions and himself and the creatures!
"Onward! To Victory!"
Kisaik is using his mortalborn ability in order to call whatever animal/beast/thing is growling from the tunnels, to call them to his aid:
Echo: Clarion Call: an extention of a tunawa's ability to throw their voice and imitate animal noises, Kisaik can make himself understood by animals near and far, to the point where depending on his Etiquette and other social skills, he may be able to convince them to come to his aid. Otherwise, he can reason with creatures that are negatively disposed toward him. This functions as a one-way communication, as he cannot understand the animal's language.
He also used a rupturing technique from magic, to make his voice abnormally loud and almost enough to disrupt the hearing of those nearby (the Aukari).