In your 'what if' scenario the victim should be taken care of and away from trying to work or interact with the public in that manner.
Unless the victim doesn't think it's as bad as we do and they are fine with the attention afterwards. Either way that's probably their choice. Stop taking away their choice.
I would assume they would be fine with you following her on an escalator as long as you're not being a creep. There are a bunch of different ways to act between staring at the floor and trying sexually assault someone.