Rivera's neighbor was being abused by her husband, he followed him to a Russian bar. He hated Russians but he hated wife beaters even more. Inside the bar he watched the guy while nursing a vodka. The guy was harassing the female employees as well, a real mysognist. After watching the guy for a while and bribing the bar tender a beautiful Russian woman to translate. He learned that the target was a member of the Bratva the Russian mafia. That complicated things quite severely. He couldn't just beat the guy up and threaten his life if he didn't divorce his wife, the wife would at best end up dead with a single bullet in the head. He had two options get her to safety under with a new identity, he didn't have the resources or the friends for that. His only other option was to have the Bratva take this guy down. He needed to know exactly what the target did for the Bratva before he could do anything.