I don't think I'm insightful enough to properly gauge an accurate affirmation for what this was, but for one thing I am certain, that person was very, very sketchy.
I've never heard of nor have any reference for such a case where the service involved wasn't that
type of work—if you get my drift.
I don't even think people scout models in the states like they do in Japan, but I wouldn't know.
I think what you did was enough considering the situation. For one thing, I know I wouldn't have done what you did. So, if it's any consolation, you're a much braver person than I.
I don't know where this took place exactly but I'd imagine if they were as we suspect and still did what they did, they're likely to do it again. It all depends though. Also, I've been a shut-in for 12 years now, so go figure.
You shouldn't blame yourself for not doing more when you did more than most people likely did (or would have done). If anything, you avoided a rather potential, unfavorable confrontation.
It's good to hear nothing worse happened and hopefully the same will not repeat.