User blog comment:BMHKain/Who to put as an opponent.../@comment-1058260-20150131161744/@comment-1058260-20150131164135

The Improvised weapons I refer to at just Jack hitting hitting his targets with objects that are made of maybe-futuristic materials. I don't remember the series very well, so, more research might be required. To give an example of his improvization, he was able to use a pair of shields made of materials strong enough to withstand the blows of a building-sized monsters. I believe this is possible with nickel superalloys.