This is a mosaic above the first burial recess in the southern axis of the western wall of the outer narthex.

On the web I found " Saint Elizabeth takes shelter in a cave in a mountain together with her son John the Baptist, and a soldier on the left side is pursuing them with a drawn sword. Elizabeth and her son miraculously escaped the massacre, thanks to a rock closing the entrance to the cave. The inscription on the mosaic scene reads, “Flight of Elizabeth”."