Here's a fun little clip from the Halo 3 Beta where an awestruck player shows off the death animations for the 'new' Spartans. To be fair, coming out of Halo 2 and onto a next gen console, it was rpetty impressive.
You can go ahead and skip to 0:25 to see the player turn into a punching bag...
You can go ahead and skip to 0:25 to see the player turn into a punching bag...