Would you argue that a naginata could not be used as a ordinary spear from horseback? Because I'm pretty sure it can. And it could be pretty deadly in a thrust.
And there are a lot of illustrations. Both from Japan of the Naginata, as well as the Guan Dao, and from China, men wielding Guan Dao, Pudao, and all sorts of variants of the Guan Dao.
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