Rama makes Sugriva assured about his power and considered Bali's crime to unpardonable of taking his brother's wife. Rama asks Sugriva to invite Bali for duel wherein Bali at first defeat Sugriva very badly and Rama is unable to identify who is Bali and Sugriva as both looked similar. For Sugriva's recognition, Rama asks Sugriva to wear garland. Upon calling Bali gain for duel while Bali arrives Sugriva signals to Rama to shoot him with an arrow and thus defeats Bali and Sugriva becomes the ruler of the Kishkindha.
I think it is up to your own opinion but personally, I would choose the second one as it represents the Raven being his sorrow and grief, and not leaving him alone, meaning that he will always be grieving.
The antagonist is the character that changes the story because he/she is the 'bad one'
