Rockstar is a proud member of Shanks' crew who takes himself pretty seriously. He got genuinely offended when Whitebeard's men disrespected him and was ready to throw down over it—honor's a big deal to him. When Shanks sent him to deliver an important letter to Whitebeard, Rockstar tried to emphasize the message by name-dropping his captain's strength and reputation. Whitebeard just tore the letter up anyway, which was exactly what Shanks expected would happen. Despite the humiliation, Rockstar wanted to fight Whitebeard to save face, but Shanks shut that down pretty quickly and told him not to sweat it.
Bounty:
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