It was Jack falling into the water that had caused the plunge he had heard and not the return of the octopus to its element.
"The Hilltop Boys on Lost Island"
Cyril Burleigh
Later on, somebody who heard about it brought him an octopus that was lying dead on the water, whose reach was forty feet from tip to tip.
"Grenfell: Knight-Errant of the North"
Fullerton Waldo
How do they catch the octopus for bait?
"Grenfell: Knight-Errant of the North"
Fullerton Waldo