"Because of the urban redevelopment in Hong Kong, vendors have to leave and shops were hence closed. Those fruit sellers, those meat sellers, were leaving at the time," Brightman said. "I was horrified by that, and I thought to myself, I'm gonna document this."
同一个句子,并列,为什么have to不用一般过去时而用一般现在时?与其后的were保持时态一致。