Planet of Dread by Murray Leinster

Moran responded instantly. His hands flew to Hallet's throat, blind fury making him unaware of any thought but a frantic lust to kill. It was very strange that Moran somehow noticed Hallet's hand insanely pulling the trigger of the blast-pistol over and over and over without result. He remembered it later. Perhaps he shared Hallet's blank disbelief that one could pull the trigger of a blaster and have nothing at all happen in consequence. But nothing did happen, and suddenly he dropped the weapon and clawed desperately at Moran's fingers about his throat. But that was too late.

There was singularly little disturbance at the luncheon-table. The whole event was climax and anticlimax together. Hallet's intention was so appallingly murderous and his action so shockingly futile that the four who were to have been his victims tended to stare blankly while Moran throttled him.