Eh, on that, I wouldn't be too sure.

[Leaning on one leg while his foot hooks behind one ankle, Leorio waits for the dummy to wobble back into an upright position before he raps one knuckle against it. Just to make sure it's still sturdy.]

With stuff like this, whether it's technology or one of those Semblances or whatever, it makes you wonder how they couldn't keep up with this big threat they were dealing with in the first place, right? Like, why not just make walls like this so that they couldn't go down from an attack?