It was a man, one of his enemies, coming out from the group in order to examine him at close range.

He let him come close up to him, with his right hand grasping his revolver still intact.
Suddenly he raised his arm, striking the head that was bending over him.

Two lightning streaks flashed from his hand, separated by a brief interval.

The first flitting blaze of fire made him see a familiar face....

Was it really Karl, the doctor's factotum ?...