The great tragedian Macready used to render this finely in Macbeth, at Banquo's second appearance.
He flung himself with averted head at the horrible shadow.

This strange impulse now seized Margaret.

She put down Gerard's hand quietly, and stood bewildered; then, all in a moment, with a wild cry, darted towards the spectre.

Gerard, not aware of the natural impulse I have spoken of, never doubted the evil one was drawing her to her perdition.

He fell on his knees.
"Exorcizo vos.