[Acid. They have gone from saws to acid. Togami would cross his arms if he could]

If the acid doesn't work and your next suggestion is to strap a bomb to the chain I'm knocking you out.

[Are you intentionally naming stuff that's dangerous when close to you? He's growing increasingly sure of it, haha]

Clearly some kind of metal. There has to be something similar in this mall, that should help to find out what exactly it is. If it's terrestrial, of course.