Dr Amir Khalil thought he was just going on another job. The veterinarian from the Vienna-based charity Four Paws International had been invited to Pakistan, where he was tasked with training a five-tonne Asian elephant in preparation for his relocation to a sanctuary in Cambodia. Kaavan had spent more than 30 years in the Marghazar zoo in Islamabad, after being gifted to Pakistan by Sri Lanka in 1985. After decades of mistreatment, and a years-long campaign that gained international attention…