In the PS3 version of Hotline Miami, how is the Raging Bull mask (Russell) obtained?
"This mask can be found at the end of Metro where you throw the briefcase into the dumpster directly to your left."
And here is some information about Metro.
"Fourth section: Drop the case into the bin. When the bum comes simply rush him and knock him down. Pick up his bat and execute him with it." - This part seems relevant.
Hope that helps.