In this instance, Carson is at Bob’s house. And the weapon, in this case, is also referred to as a “pocketknife” instead of a “camping knife”—which, this time, he pulls out of his pocket. In other iterations of the story, Carson already had the knife in his hand before the attack. In the film adaptation of Gifted Hands, for example, Carson is seen whittling a stick with a large hunting knife and playing classical music on the radio, which incites the other boy’s anger.
Perhaps the biggest departure from the original version of the story comes in 2011’s America the Beautiful, in which the situation is described much more as a random encounter.