The thing that had been so real a moment before was now utterly invisible.

Hazelton began to share his chum's suspicion as to the utter breakdown of his nerves and powers of vision.
"It was nothing, of course," said Harry, shamefacedly, but Tom vigorously took the other side of the question.
"See here, Harry, it must have been something," insisted Reade.

"You're not dreaming, and you're not crazy.

It would take either one of those conditions to make you see something that didn't really exist.

No mere nervous tremor is going to make you see something as tall as a man, standing right over you, when no such thing exists." "Well, then, where is the fellow ?" Harry Hazelton demanded, helplessly, as he stared about.