The mobile phone footage shows 19-year-old Muskan Khan riding a scooter into the yellow-walled compound of her college campus in Mandhya, a city in Karnataka in south-west India, on 8 February. She parks it, steps off. Around her, a jumpy, agitated crowd of young men dressed in matching saffron-coloured scarves are caught in the throes of a tirade: ‘Jai Shri Ram,’ they chant, spinning the cloth above their heads, as though punctuating the chorus of a pop song. Khan has to walk past the boys to enter the college building. They charge at her, taunt her, demand she take off her hijab. She punches the air, her body tilting, face crinkled in a frown, and declares: ‘Allahu akbar.’