don't know the answer to your question as my presence seems to send fish further away than that. it be weird to hook a fish so close, tho.
i do remember i was on the yampa once and saw a good 16-incher holding about eight or nine feet from where i was standing so i let my fly drift directly above it with no success. it seemed to be dead since it wasn't wiggling around so i poked it with the tip of my rod and it slowly swam away. it ended up being a white sucker so no big deal.