Do We Leave the Metal on the Ground or Under the Spider?

It seems like he's been freezing these people and then eating the ice. So do we leave the metal on the ground or put it on the spider? Or maybe just hang it around the spider's neck or something. Hopefully the metal is still... so it could be like, hide the metal among this ice stuff. But wouldn't it be impervious to being frozen if the whole point is to get it frozen? And also, I don't think we can turn it invisible. Not with a yank.