I can not walk a straight line at any time, as I have had ankle problems since being a child. So if I got stopped and asked to walk the line as a straight line it would never happen, with or without shoes. So if I had even a small heeled shoe on and a gravel parking lot I can pretty much tell you I probably walk like a drunk and that would be even without drinking even a sip of wine. Things are not always what they seem. Since I was not there I am not judging either one of them.