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It's never stated to be specifically dependent on a normal weapon.Shining road power was depending on weapon he has
Characters in the series need unique qualities in order for their weapons to do that kind of thing.
Even if that's the case, a heavily limited version of Shining Road could easily be >>> Lancelot's punches since it could one-shot Arthur, whereas his own blows couldn't.Since his spear not destroyed at the end of their fight, i would say he was limit his shining road power.