Blond convict: Go ahead, dust him. Blow his fucking head off!
Konefke: Dear sir, I never thought this would happen to me, but I was working the late shift and this big titties mama comes up to me.
Myerson: And, I need protection, cause another guy got spiked last night, and this is serious shit, man!
Answer: In the scene before that he scraped and cut his arm on the file cabinet as he was closing it looking for information.