Another school kidnapping in northern Nigeria, another release, another denial of ransom payment. The freeing of 279 girls in Zamfara state means relief for parents but concern over what has now become a pattern. We are far from 2014, when the whole planet picked up on the hashtag #BringBackOurGirls with the abduction of the Chibok schoolgirls by Boko Haram in north-eastern Borno state.