User blog comment:Martialmaniac/Hatsu series - Pokkle/@comment-4896558-20151104011622/@comment-5780397-20151104123536

The point is that Enhancement being basically "a talent at keeping one's aura around their body", I don't see how he could combine it with his arrows. Since tehy are made out of aura, he should be unable to use Shu on them, too.