I have found that if a buck only blows (snorts) he is trying to figure out what the heck the noise was. I think there are 3 or 4 different kinds of snorts. Anyway my point is I have found that if they only snort (blow) at me, but they didn't see me or smell they, they do come back. However if they see me I found they come later (i.e. after dark) or take an alternate travel route by circling around where they saw me for a while.