They didn't know what it was more than likely. They caught a glimpse or heard a sound and spooked. Now as for how bad. They're going to more than likely be extra careful and vigilante around that area for a few days if they come near it at all. Other deer that weren't around are OK. But, you have caused some flight. The ones you spooked could be the ones that pass that spot everyday. I'd leave it alone for a few days and hunt somewhere else. It all goes back to the old saying, "everytime in you leave sign for the deer to pattern". When they start putting two and two together they get you. It's a known fact that if you hunt and hunt a spot where deer receive a moderate amount of pressure, you'll see less and less. Every sign post you leave makes them more wary. Give it few days, watch the wind and your scent whenyou go in. Analyse what you did that might have caused them to pick you off. Make sure you don't have a noise in you bow or stand.