I think the demonstration would have hit home a little better if they took something like a Resusci-Annie or a crash test dummy that didn't have any metal in it, and put something metal inside like the size of a pacemaker or one of those pins they put in your knee or an earring or piercing in a, umm,
strategic location... you get the picture. Then patients and operators would understand the damage that can happen.
Otherwise, that was way cool.