If it’s only one duck then he is probably super lonely. Ducks need companionship
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My boys do the same thing but I have no hens.
I have one duck (hen), bottom of the duck totem pole that does that also, puts her head down and charges at me, as soon as I look down at her, she turns and runs away quacking like mad! (I swear that I'm not an ax murderer!!) I'm assuming it is a challenge to my place as flock leader, she wants to be bumped up in the ranks. I could be totally wrong about that but that's how I read the behavior in my particular case.