What was Mrs. Hall shocked to see?

Mrs. Hall was shocked by the bandages covering the Invisible man's head.

But it was not that which startled Mrs. Hall. It was the fact that all his forehead above his blue glasses was covered by a white bandage, and that another covered his ears, leaving not a scrap of his face exposed excepting only his pink, peaked nose. It was bright pink, and shiny just as it had been at first. He wore a dark-brown velvet jacket with a high black linen lined collar turned up about his neck. The thick black hair, escaping as it could below and between the cross bandages, projected in curious tails and horns, giving him the strangest appearance conceivable. This muffled and bandaged head was so unlike what she had anticipated, that for a moment she was rigid.

He did not remove the serviette, but remained holding it, as she saw now, with a brown gloved hand, and regarding her with his inscrutable blue glasses. "Leave the hat," he said, speaking very distinctly through the white cloth.

Her nerves began to recover from the shock they had received.