I tore a ligament in my ankle at Marine Corps OCS a lifetime ago when I got my foot wedged between tree roots on a boots and utes run. My heel was momentarily 180 degrees reversed and next to my shin.
I’ve never been shot but I imagine that’s what it must feel like. I’ve had several broken bones and joint separations over the span of my life but I’ve never felt pain like my ankle ligament tearing. I can’t imagine what a torn Achilles would feel like but I don’t think he’d be walking off the field and getting stretched.