What does Billy’s reaction to Grandpa’s injury say about Billy’s values and attitudes?

Grandpa had fallen, twisted his ankle, and gotten knocked unconscious. They all try to revive him and it works. Billy suggests going down into the gully, where they found Old Dan, and building a fire to warm up by. And in the meantime, someone can go for help. Grandpa doesn't like this idea. Billy, however, is more concerned about Grandpa than the competition. This speaks to Billy's prorities and love for his grandfather.