Why did Milez choose to attack Bri in the way he did?

Miles raps first. While she listens, Bri plans her response, making lists of rhyming words in her head. Miles's rap ends with a few lines about Lawless's murder. Flooded with anger and memories, Bri freezes when it is her turn. She is distracted recalling the day of Lawless’s murder. When Bri fails to rap, Hype awards the round to Miles. Miles's second rap is unrelated to his first and to Bri's silence, making Bri believe his songs are prewritten. Her response accuses Miles of not writing his own songs; everyone cheers. His next piece is similarly irrelevant to the battle. Bri wins the battle with her final song.