But he did not give up.

He was about to retort when--crash! thud!--the noise of a violent struggle in the hall outside drew all eyes to the hall door.
An instant later the door slammed open and a disheveled young man in evening clothes was catapulted into the living-room as if slung there by a giant's arm.

He tripped and fell to the floor in the center of the room.

Billy stood in the doorway behind him, inscrutable, arms folded, on his face an expression of mild satisfaction as if he were demurely pleased with a neat piece of housework, neatly carried out.
The young man picked himself up, brushed off his clothes, sought for his hat, which had rolled under the table.

Then he turned on Billy furiously.
"Damn you--what do you mean by this ?" "Jiu-jitsu," said Billy, his yellow face quite untroubled.