Source
He drew three crosses on his chest.
This cross he drew every time he encountered a black cat since he was a child, however, after he finished drawing this time, he was confused by the cry of a magpie flying overhead.
He had done it many times and it was done, so he performed the ritual again.
Finally, when the magpie swoops down on the cat, the cat wonders for the first time if the action really works.
Feeling attacked, the cat jumped on the bird's face and scratched six furrows in its face with its claws.