Through shared experiences two people can go from enemies to brothers by realizing that they aren't as different as they thought. Here are 4 events that were crucial towards Matt and Attean's brotherhood.
Matt's Cabin
This is the place Matt and Attean first meet. To me, this cabin represents the start of their relationship. At first, they both strongly dislike eachother.
Killing the Bear
Matt and Attean Kill the Bear
When Matt and Attean kill the bear it is one of the first times they work together to acheave something. I think this event is the start of a turning point in their friendship.
Attean's Village
Attean's Village
When Matt visits Attean's village it helps Matt understand Attean's life better. When Matt plays lacrosse with Attean's friends they accept him.
Matt saves Attean's Dog
Matt Saves Attean's Dog
When Matt saves Attean's dog, Attean is very grateful and their friendship grows even more. Later in the book when Attean gives Matt the dog it shows Matt has fully earned his trust.