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Renegade
Betrayal Implied
Using 'renegade' often suggests betrayal to the original group, emphasizing the negative aspect of leaving. 
Disloyal Connotation
'Renegade' carries a connotation of disloyalty or rebelliousness, often used in serious or dramatic contexts. 
Strong Emotion
'Renegade' can evoke strong emotions, as being one is seen as a bold and drastic action. 