When professor Anna Cheung woke up in New York on June 12 to news of clashes between Hong Kong police and protesters, with tear gas and rubber bullets fired in the city of her birth, her heart sank.“I had a bad feeling things were coming to a head and might take a turn for the worse and get ugly. This confirmed my fears,” says the 54-year-old mother of three who moved to the United States more than 30 years ago.She had helped organise a solidarity rally in New York’s Times Square on June 9, in…