This Chapter is important because it shows how Tom and Huck make an oath to not tell so they don't die Injun Joe. That represents how Childish they are because they think that you cannot break a blood oath.
We should make a blood oath, so we don't get killed by Injin Joe.
Oh No! is that a stray dog! we're gonna die!
Huh, where's Sid?
Tom and Huck decided that to keep themselves safe from Injin Joe the must make a blood oath and burry it.
Once Tom and Huck are done, a stray dog howls and they believe that trouble is coming there way.
Tom wakes up the next morning to find that Sid is already dressed and is gone.