Dick concluded to wait and bide his time.

The chance might yet come to catch Bert Dodge red handed.
"Though, if he suspects that I saw his exposed cuff, he'll take pains that there is not further chance!" decided Cadet Prescott.
After that he went to his room, where he told Greg what he had discovered.
"It's suspicious---mightily so," declared Holmes.

"But it isn't proof---not yet!" Nevertheless, Greg, once he had heard, could not get the matter out of his mind either!.