Ava’s mistreatment of Shu Yi reaches a climactic high. Before, Ava indirectly enabled her racist peers by refusing to condemn their actions and defend Shu Yi. Now, she actively participates in their bullying, calling Shu Yi a racist slur. The urine that drips down Shu Yi’s leg is significant. Earlier, Ava noted that Shu Yi’s arrival corresponded with Ava’s mum removing the undersheet from her bed, insinuating that when Shu Yi arrived and the kids stopped bullying Ava, Ava stopped bedwetting (which was implied to be a shame response to being bullied). Now, as Shu Yi urinates, it’s clear that Ava has passed along that shame to Shu Yi.