When I asked Ninja Gaiden 3 lead Fumihiko Yasuda how the protagonist was able to glide through the air with nothing more than a black, skin-tight suit, I committed the sin of dragging logic into a discussion that was utterly incompatible with it. Ryu Hayabusa can fly because he's a ninja, and that's an axiom you'll just have to accept.

The legitimate mystery is why an army of hapless (and soon-to-be-headless) soldiers would stomp all the way through the brutally extracted entrails of their comrades, and still insist on fighting an enraged man who literally just flew in. The gushing violence signals a welcome change from Ninja Gaiden Sigma 2's purple energy nonsense and comes across as silly and satisfying, rather than OH GROSS. Hayabusa's sword never seems to clip through enemy bodies so much as it slides and scrapes through them.