I usually park way off,and walk in,but I also have observed 4-wheelers ride by,and then no more than 15 minutes after they have left,have seen deer move through.I agree if they hear you slow down,and then continue on they may not pay you any attention.How many times have you walked into a spot,and jumped a bedded deer on the same path as you were leaving..just because you stopped to look at a track,squirrel etc..They don't know why you stopped,but they aren't taking any chances.Thanks for the story.