Patrick Frater Asia Bureau Chief “Twilight of the Warriors: Walled In,” a Hong Kong-produced action thriller, took the top spot at the mainland China box office over the latest weekend. But it was a quiet session and came ahead of a welter of new releases targeting the May Day public holiday. The film, which is among those that have a Wednesday (May 1) official release date, earned $5.5 million (RMB38.9 million) between Friday and Sunday, according to data from consultancy firm Artisan Gateway. The nationwide weekend total was a slender $18.7 million.