How to describe this body motion?


Hong Kong
Could someone give me an idea, how can I describe (just in one word or a phase) the motion of this person's legs? (see the animation link below)

[Sorry, the forum doesn't allow me to post links, please copy the above URL (change xxx to www) to your browser to see it]

Imagine the situation here is, the character is being dragged by someone rudely on the road, so the legs "respond" to this action. But how can I describe this very precisely?

Thanks in advance.
  • B.P.

    Hong Kong
    So I should simply say, "he's kicking." Right?

    Oh, I know the noun "flail" but I'm not sure if it can also be used to describe this action.

    Thanks for you guys helping me.
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