Mysterious naked woman on the Shanghai Line 1 subway

We're not sure what's going on here, but according to a tipster and these (very NSFW) photos, a woman stripped down to the nude on a Line 1 subway train last night after getting into a heated argument with a man. She then grabbed onto his leg and was dragged a couple of steps before the man escaped her grip and ran off. Afterwards, she walked around the subway car naked until a middle-aged lady gave her a coat. Police came at the next stop and took her away. The police said they had seen her do this before, the blog post alleged. So... Porn-y bad-taste promotional stunt or the unfortunate capturing of someone who's seriously disturbed? Update: Were the images taken down?