EddieCyrax
Blue Belt
If you read the last two paragraphs of the forum post you pasted into your OP, you'll see reference to "follow a girl until she notices you", or "look for a girl walking by herself and follow her, after a while they notice you".
The way it reads is that this particular person found the "chase" excited him after the first instance involving direct contact (stopping to quiz them, then following) and he progressed to the following without contact - causing distress by simply being present.
A girl getting approached and quizzed is a different situation to 'just' being obviously followed around and much easier to identify (but unfortunately, not particularly easier to prepare for or deal with).
Three components of most physical attacks..... Interview, Positioning, Intent...... given the individual stopped her to ask for time then followed her..... 2 strikes in my book......