Ryuzio ducked behind a rocky pillar, finding that unlike the flames of his rage, the ones of his Ethersurge were shrinking. Running around the Ezlus Mines with his Surge activated to find Hitryel, using a Dragon Bullet to punch Lexnal away from Arold, flaring his Surge to absorb the damage that otherwise would've broken his bones by now, he'd simply used up too much of his Ether. The lame part was most of it got wasted on defense.
He could feel it fading, the blaze of Ether inside him burning out to tiny embers. To keep himself from getting overwhelmed and blacking out from the impact of the invisible blasts that were shooting out from Lexnal, Ryuzio had to pump as much Ether as possible into his muscles. He needed that to evade the attacks and counter and to numb the pain that would otherwise force him to stop this fight. Or try to, at least.