No eye followed what happened.
Can the eye follow such speed as the cracking lash of a whip?
There was only one report.

The forefinger of Strann did not touch his trigger, but the gun slipped down and dangled loosely from his hand.

He made a pace forward with his smile grown to an idiotic thing and a patch of red sprang out in the centre of his breast.

Then he lurched headlong to the floor..