You should make amends if you have stolen from people.
Neil is caught stealing by Stella and is being accosted by her for being a common thief.
Neil wants to respond to Stella's anger.
Neil tells Stella that he understands he did wrong, and he'll do anything to make it right.
Neil tells Stella to quiet down, or he's going to make her quiet.
Stella is relieved that Neil will repay her in some way for doing her wrong.
Stella is terrified that Neil is a violent psychopath and is sad she can't reason with him.