By Lu Jiaxin Through Rain’s headphones, the lyrics, “I could be a river, I sweep you away, posit all my creatures at the grave where you lay.” played on an endless loop. They were from a song called Metamorphosis by Rain’s favourite screamo band, Your Arms Are My Cocoon from Chicago. It was early April and at a university in mainland China’s Guangdong province, Rain, who asked to be identified by a pseudonym for privacy reasons, was daydreaming about attending the band’s concert in Hong Kong later that month. However, Rain hadn’t yet received a visa for the city and the clock was ticking. Born…