That person must be easily spooked. I'd have just thought "Moron. And went on my way."

I did have an incident recently where I was being stalked, No matter where I went these 4 other characters kept following me. Jumping when I jumped, mounting up when I tried to mount and get away and trying to tap mobs when I started firing on them. (Luckily I always seemed to get the hit in first).

Then I remembered that I was multiboxing and they were my characters. What a relief.