Hunt them in the evening then. You know where they are roosting, get there before they do and just wait. I agree with Charlie, i don't think they noticed you all that much or they would have took off like a bat outta hell so I would be inclined to believe they will continue to travel through there. Just don't hang your head, we have all made those mistakes before and you have to learn from them instead of just replaying it over and over. Figure what you could have done better, such as getting out a little earlier possibly and try again. Good luck and I hope you get one of em!