A few years ago, I was walking a deer trail fairly quickly to get to a glassing spot. Out of nowhere the rattling started, luckily, I could tell it was to my left, so I quickly moved a step to my right, looked over and a few feet away there was 4-footer reared up, pissed and ready to strike. Thank goodness I stepped in the right direction, or he would have got me. Grabbed the biggest rocks I could find and took care of him (didn't want to spook any deer with my pistol). I usually let them be in the wild, but had to walk that trail back later on.