Most powerful line in the movie
To me the most powerful line in this movie is when Spargo asks Pratt if he wants to kill him, then Pratt replies:
"First, I have to kill Bone".
This is the most powerful line in the movie and has to be one of the most powerful ever scripted.
Bone's dark glasses hide the expression of his eyes, however we can tell that he has been disturbed by what he just heard. His reaction is probably not of fear, but certaily Pratt's words didn't leave him indifferent.