Todd viciously baring his teeth at Copper is a powerful moment.
I'm talking about this shot...
https://www.youtube.com/watch?v=Qj2U3IG6uVE&t=1m17s
A powerful moment that shows how far their friendship has fallen, and it really drives home the point that things will never be the same between them. A very well animated shot, and they clearly did their research as well. One time I saw a video on YT of a fox trapped in a cage (before being released back into the wild). That thing was like a monster.