Exactly. I was in Broadway today looking at TVs. A guy came up immediately and asked if I wanted help. I politely declined. So far, so good. But then he proceeded to follow me around the shop, always within two feet of me. It got quite unnerving. I tried walking really fast around a row, but he just followed. In the end I left without buying anything.
I can't stand being shadowed. This is why I often put off shopping for certain items, or try to do it online (difficult in HK).