come on you noob, you can replicate the exact thing, but it requires switching plasma rifle on elites for a energy sword.
Get to the level on legendary where you first get the tank and you are on the bridge chasing after the fucking bug.
Swap the tags for plasma rifle and sword.
Go halfway across the bridge in the tank. Hop out and knock the elites of their ghosts.
Waste all ammo except for a plasma nade. You will then be on the same exact bridge as in the demo(same exact place), with elites with swords, (you with one nade) and banshees flying overhead!
If you want extra effect, copy the e3 demo to a dvd and while you are with the elites around you, hook up the dvd player video inputs/audio and play the dvd. You will then remove the dvd and hope your MC isn't dead. You have now created Halo2: e3 cut!
I can't believe i actually wrote all that out. <