"I wonder what it can mean?" speculated Frank.
He was uneasy. He knew the guide might have fired at some kind of small game, but for some reason he fancied such was not the case.
Was Old Rocks in trouble?
Catching up his rifle, Frank started on a run in the direction taken by the guide.
Down into the valley he went, his eyes wide open. Suddenly, a short distance before him, there was a hissing, rushing roar, and a column of mud and water shot into the air.
There were the mud geysers Old Rocks had started out to look for.
Toward the geyser hurried Frank, still looking for his companion.
Before the column of mud and water had ceased shooting into the air, Frank came upon a startling spectacle.
Not far from the geysers Old Rocks was engaged in a hand-to-hand encounter with a huge grizzly bear!
On the ground near by lay the body of another bear, telling how accurate had been the guide's first shot.