Just don't move... he'll relax after a while and move on... maybe. I tell you what I did once. It was bow season and turkey season was open. I heard some turkeys earlier in the day so was perched 18 feet up sucking on a diaphram call. A doe wanders in and gives me the stare. I stared back. Finally out of curiosity I just gave out a soft lost turkey call. She flinched but just started feeding. Of course we won't always have a turkey call in our mouth... but it seemed to make her think I was OK.