Link had once competed in underground boxing rings, sustained many injuries, and inflicted plenty on others. Seeing his opponent make that move, he instantly realized the man had an injury in his ribs, possibly an old one.
Considering Rosniel was a veteran with over ten years of boxing training and more than a hundred matches, having injuries was normal, and competing while injured was fairly common as well.
Back then, Link had participated in no-protection fights and had two ribs broken by a kick.
But to earn enough money for his mother's medical bills, he had to fight despite his injuries, vomiting blood as he fought, which created an astonishing visual effect. The wealthy spectators below the stage, their faces flushed, roared and screamed, throwing bills into the cage.
That match alone netted Link over three hundred thousand.