Maybe there’s nothing to do, or for some purpose, the author of the video used the chain for an unusual purpose. If you imagine what a mace is and is needed for it, then you definitely have not seen a chain yet.
To create a craft, a chain and a welding machine were needed. First of all, a ball was formed from the links, which was welded by electric welding. Then comes the chain itself, as planned in this weapon, a handle has already been made from the final links.
The mace turned out to be what is needed, and most importantly the brutal in appearance. Tests showed it turned out to be a very good weapon for a splash of emotions, let's hope it was created for these purposes.