Now half asleep he heard the sonic boom
Knock his window, burly legerdemain;
He felt it in his bed, across the room,
Rattle the window pane
                                once—and only once—as if
It did not ask but kicked the door with steel-toed boot
And took possession, one of the roughs: tough,
                vertiginous, destitute.
The possession it announced was nothing final
No knock of Linz brimming with doom; but