According to the interview I heard when he was first found (I think it was the search coordinator, not sure anymore), the kid had seen the horses but was afraid of them so he didn't get closer.

1- If you can see horses and humans, odds are pretty good that rescue wistle will probably be heard.
2. Afraid of horses?!? What's up with that? <img src="/images/graemlins/confused.gif" alt="" />