They Were Curious
Whatever was going on down there had piqued their interest. They wanted to see what was under the pile for themselves, but they had no idea how they were going to get a decent look at it. So they were going to devise a strategy for approaching the mound and discovering what the crabs were hiding from them.
The Guide Stayed With The Family
After much deliberation, the guide opted to remain with the family. Despite his worries about the circumstances, he required his job and a solid salary. Of course, he begged them to swear him that if they ever discussed this with anyone, they would never divulge his name.