How do Hiram and grandpa's view of what happened at the riverbank with Emmett Till differ? Explain.

As soon as Emmett is on dry ground and about to take the lunch bag, R.C. wakes up. Emmett tries to explain that Hiram promised him the lunch, but R.C. becomes furious and pushes Emmett to the ground. R.C. then takes a fish, cuts out its guts and holds it over Emmett's face until Emmett chokes for air, allowing R.C. to shove the guts in Emmett's mouth. The entire time, Hiram and Emmett's cousins stand there powerless to stop R.C. As Emmett is carried away by the cousins, Hiram wants to say something but he cannot, as he is to ashamed of himself for allowing this to happen. Hiram seeks Grampa's advice in Chapter 9, but Grampa tells him not to worry about what happened at the river. He also says that it is possible Emmett deserved to be mistreated as whites and African Americans should not be friends.