I don't think this part is right. Edison discovered that it takes a lower AC voltage to electrocute you than a DC voltage. Also, according to Wikipedia (questionable) it claims the minimum current where you can no longer let go of the line as 15mA for AC, and 45mA for DC. Wouldn't that make low frequency AC (where the skin effect doesn't come in) much more dangerous than an equivelant DC line since it could shock you more easily and hold you onto the line more easily? It seems (if the Wiki claim is accurate) that AC is will hold you onto the line more easily than DC. It also seems that AC having no voltage and no current flow at some times has no effect on making it easier to let go of AC...in fact it would seem to make it harder to let go.
https://en.wikipedia.org/wiki/Electric_shock
It would seem that an AC line will pull you in more easily because it takes less current than DC to do so, but it's harder to let go of an DC line than AC because it contracts your muscles in one direction only, and causes no convulsions. AC- easier to get stuck on but easier to pull away. DC- harder to get stuck on, but once you are stuck it's harder to pull away. A strange kind of balance between dangerousness.