Personally, i'll never wear boots with such a low heel again.
The only time I seriously thought I might die riding was when I was wearing boots with low heels. I was on a three year old that spooked and blew up, I couldn't get him pulled up and the bucking got worse and worse. My left foot ended up slipping completely though the stirrup sliding right past my heel and I was bucked off. I was dragged for a couple of minutes while I was furiously trying to kick my foot out while avoiding being stomped on. What saved me is I ended up breaking my own ankle and a couple bones in my foot so my foot could slip out.
I haven't worn low heeled boots riding since.