> I've heard of this, but what's the advantage? They still need to recharge the torsion the same way, which must've taken longer than someone manually feeding the next bolt.

https://en.wikipedia.org/wiki/MythBusters_(2010_season)#Epis...

> They set up 5 targets at 90 yards (82 m) and brought in professional archer Brady Ellison to provide a benchmark for comparison. He hit the targets in 2 minutes, using 11 arrows. After further breakdowns and repair work, Adam and Jamie accomplished the feat with 15 arrows in 1 minute and 50 seconds.

Certainly sounds like a win to me, if it was faster and just as accurate as the worlds number one ranked recurve archer :-/

You can train a man to turn the windlass in about an hour. It takes years to get an archer to the same accuracy and speed.

So, a definite advantage.