The Equalizer S01E12 - Reign of Terror

A doctor takes over an inner city clinic, upon arriving she discovers that the previous doctor has a deal with the gang who runs the neighborhood to provide them with drugs in exchange for letting them stay there. But when she learns of this, she tells them that it ends. The gang then threatens her but she's not intimidated. But her assistant knowing she's in over her head calls McCall. But upon meeting him, she refuses to accept help from because she doesn't believe in violence.