His tall form threw a long streak of blackness across the threshold.

A streak of living blackness, he flung himself for the same goal.

He blinked in that direction; saw a tall streak of blackness against the wall.

This was a moving streak of blackness, coming inward from the opened door to the living room.

That streak of blackness on the floor had been real; some living being must have caused it.

He saw streaks of blackness; one seemed longer than the others.

A streak of living blackness lunged into the new struggle.

A long streak of blackness that sliced from across the street began to take on line.

The sun had set and long streaks of blackness showed upon the grass.

He had noted nothing more than a disappearing streak of blackness.