This is from Wonder Woman, and a woman on the left is laying the wounded woman down on the grass.
She says to the hurt woman, "lay still."
I don't understand why it's "lay still" instead of "lie still".
I already googled the difference between "lie" and "lay" and lay is a transitive verb which needs an object. It also doesn't make sense if lay here was used as a past form of "lie", since in this scene, the woman is ordering(not exactly ordering in the sense of forcing someone) the wounded woman to lie down still and thus present verb should be used.
What am I missing? Why is it "lay"?