The combat that followed was terrific.

First Guido, raising his mace high in the air with both hands, brought
it down with terrible force on Tancred's mailed head. Then Guido
stood still, and Tancred raising his mace in the air brought it
down upon Guido's head. Then Tancred stood still and turned his back,
and Guido, swinging his mace sideways, gave him a terrific blow from
behind, midway, right centre. Tancred returned the blow. Then
Tancred knelt down on his hands and knees and Guido brought the mace
down on his back. It was a sheer contest of skill and agility. For a
time the issue was doubtful. Then Tancred's armour began to bend, his
blows weakened, he fell prone. Guido pressed his advantage and
hammered him out as flat as a sardine can. Then placing his foot on
Tancred's chest, he lowered his vizor and looked around about him.

At this second there was a resounding shriek.

Isolde the Slender, alarmed by the sound of the blows, precipitated
herself into the room.

For a moment the lovers looked into each other's faces.

Then with their countenances distraught with agony they fell swooning
in different directions.

There had been a mistake!

Guido was not Guido, and Isolde was not Isolde. They were wrong
about the miniatures. Each of them was a picture of somebody else.