To what decision did Noah come?

Noah decided to leave the family and make his way along the water.

"I can't he'p it. I can't leave this here water." Noah's wide-set eyes were half closed. "You know how it is, Tom. You know how the folks are nice to me. But they don't really care for me."

"It ain't no use," Noah said. "I'm sad, but I can't he'p it. I got to go." He turned abruptly and walked downstream along the shore. Tom started to follow, and then he stopped. He saw Noah disappear into the brush, and then appear again, following the edge of the river. And he watched Noah growing smaller on the edge of the river, until he disappeared into the willows at last.