Definitely the penultimate cutscene where the Spartans make the elite honor guards look stupid, and Forge stabs the Arbiter multiple times.
#2 would be the cutscene where the Arbiter backhands the elite who tells him the Spirit of Fire had arrived for no apparent reason and sends him flying like twenty feet in the air.
or the one where The arbiter is just randomly dragging his sword through the platform for no apparent reason.
The Arbiter was just a ****ing badass.
Did you see the size of his ****ing forearms? They're bigger than most Elite's legs.
He would have eaten the Arbiter from Halo 2 and 3.
What is happiness but the feeling of power increasing, and obstacles being overcome? -Nietzsche