With his younger brother at the mercy of Jin, Yang Hui jumped in front of his brother and ate the next bullet for him. His fully metamorphosed beast form, unfortunately, had an even higher level of demon affinity, causing him to take extra damage from this shot. The bullet went through his right chest and exited his body cleanly.
And the bullet seemed to add insult to his feeble attempt of him protecting his brother even further by coursing out of his body and ricocheted on to hit Yang Rong's shoulder.
However, the brunt of the Ruby Fire explosion had been reserved for Yang Hui, and it had made a mess of his right lung. Unlike Yang Rong, who had Steel Fur Skin to soften the damage, the explosion was clear for everyone to see as his chest skin ruptured and blood burst out impactfully, causing him to asphyxiate from the gush of blood coming out of his throat.