A man was held for assault and possession of illegal weapons on Tuesday after allegedly catching two off-duty policemen on camera while taking pictures of a Sham Shui Po food court, in what a local councillor decried as an “arbitrary arrest”.Police said the man, a 23-year-old surnamed Ho, had aimed a flashlight at the officers so they took him to a police station for further investigation. He was still under detention by 11pm, but had been sent to Caritas Medical Centre after he said he felt…