Final answer:
When the boys' foothold disappeared in Kloochman Rock, they likely had to use their ingenuity and surroundings to find a new path forward, as is shown through similar trials faced by characters in the text's excerpts.
Step-by-step explanation:
In the narrative of Kloochman Rock, when the boys' foothold disappeared, they faced a perilous situation which is not explicitly described in these excerpts. However, the text provides examples of characters dealing with challenging and hazardous terrains, such as climbing steep slopes, negotiating boulders, and encountering other difficult natural obstacles. Hence, it can be inferred that like these characters, the boys would have had to utilize their surroundings, like nearby rocks or crevices, to find a new path or method to safely proceed. While every character in the excerpts is met with risky situations while navigating the wild landscape, each uses resourcefulness and caution to overcome the obstacles they face.