Police detained two foreigners working in Hong Kong while clearing extradition bill protesters in Mong Kok on Saturday, in what is believed to be the first arrest of expats during the demonstrations that have gripped the city since June.One of the men was a 36-year-old Filipino who had been working as a parade dancer at Hong Kong Disneyland since 2008, according to a source.Riot police pinned down the man, who was not wearing any protective gear, in Mong Kok at about 11pm. He reportedly tried…