[ This is great. All they need now is a training/testing montage to "Immortals" when it's ready. ]

Right! So like a booster thing, right? Remember, it's gotta look cool and organic, we can't just sticky-tape springs on my shoes. N-Not that I tried it or anything. But! You're the inventor! Do you need me to draw, like, blueprints or anything? Does it need to be in a blue pen? I got other colours, too! Ahh, Hiro, I'm so psyched for this!! Have you started it yet?! [ ...That should answer his other question. ]