Dude, you have no idea how lucky you were. If it were a mountain lion, which it very well could have been, it could have taken you down in a heartbeat. Thankfully you didn't run otherwise it might have been another story. My roommate told me a story once on an elk hunt a few years ago he was being tracked by a mountain lion which got within 10 yards, thankfully a few rounds with the handgun ran him off. Man I would have hated to be in your shoes at that moment. Make me glad I night fish in my boat. At casitas I hear all kinds of critters rustling around in the bank brush line. Damn, now I am going to be thinking about your mountain lion the next time I heard something go bump on the bank.