if you were in Vegas and a hot chick approached you (a pro) and wanted $500, but you settled on $200 and on the way to the elevator she was texting furiously to God knows who (which in hindsight should have been a huge red flag) and then, upon entering the hotel room, she quickly darts into the bathroom and locks the door where she remains for 10+ minutes.
Then, when she finally comes out, she points her camera phone at you, takes your picture and says if you don't give her $500 right now, she's going to say you raped her and call the police.
That first part always happens. The second part is new to me. I think I would tell her to go fuck herself. She's bluffing.
My first thought is I guess I'd pretend to pay up, punch her in the throat, take her phone and run out of the place, but there are cameras everywhere so they'd find you eventually. And then you did not specify if the room was in my name or not, so that could pose a problem as well. Very tough situation.
: I guess the correct thing to do is say OK be like that, hang tight and I'll call the cops and we will get this sorted out.