The supervisor of a prestigious secondary school in Hong Kong has hit back at the director and distributor of a controversial coming-of-age documentary, accusing them of “defaming” the integrity of the institution’s principal and placing her in an “unjust position”. The claims, contained in a letter sent to students of Ying Wa Girls’ School on Monday, mark an escalation in the war of words over a screening of To My Nineteen-Year-Old Self that was planned at an Italian film festival that begins...