Clint Barton was ridden with guilt and sorrow after his wife and his three children were all killed during the Snap. In the five years that passed, Barton decided to take up a life of vigilantism, serving justice to those who were not killed by Thanos. Barton made his way to Mexico to eliminate the reassembled Mexican Cartel members who survived the Snap.
Ronin arrived at Juárez, Mexico, continuing his mission to kill all criminals who survived the Snap, targeting the Mexican Cartel. Ronin used his superior skills as an assassin to infiltrate their base of operation and began to slaughter all the members ruthlessly and quickly, that the Cartel could not even get the chance to draw their weapons. Ronin would then leave a horrendous scene of dead bodies that would be found by the federales, later James Rhodes would share this with Natasha Romanoff who was searching for him.
James Rhodes then reported his findings to Natasha Romanoff, stating that he might not even want to find Clint Barton, scared of who he has become. However, Romanoff asked if he could keep looking for him, which he agreed to. Rhodes would eventually track him down to Tokyo, Japan, where he planned to, and successfully killed all the members of the Yakuza, led by Akihiko.