((The knife was actually blunt... but removing that aspect for the sake of the storyline...))
Olhal took the kick full blast; and lost all of his air in one blow. It took him a few moments to realised what was happening; a few moments too late, as he sank further. He now knew if he didn't attempt to surface immediately, he wouldn't survive; and if he did surface, he'd lose the knife forever... which could result in being as bad as death. Struggling against his natural instincts, he swam deeper down, the pressure beginning to build up in his head...
He made it. Somehow able to find the knife in the darkness, he remembered something vital; he pressed it against his chest quickly. Although it did not harm him, it propelled him up incredibly quickly, bubbles streaming out behind him; and erupted from the surface of the water like a rocket... and at the height of his jump, lost control of the knife. The knife span out, flying into the trees... and he promptly crashed back into the water, sinking almost as far as he had swam earlier, but managed to surface successfully, gasping when he reached fresh air.
Fyroh heard his name being called. He recognised the voice at once; and still carried a phobia with it. He lightened his steps, and began running faster away from the titan; unknowledgably closer to Xor.