Finding the holo-drone

In Halo 2, in the level The Oracle, there is a way for the player to find the holo-drone that the Heretic Leader uses before it is activated.

First, when you start the level, go to the room with four pillars on the right and left side, jump on the pillar that is closest to the glass tube leading to a small square room in the center in the room, break the glass and jump on one of the four holes in the outer part of the square to get in, trying not to fall. Then, when you get inside, it's dark but there are four glass windows on the top of the square. Break one of them and jump (Crouch jump or Grenade jump recomended) on the edges, then you can see another room on top of the square. When you jump to get there, there are 2 holes on each of the four corners. Two corners have pillars to help you get to the hole, but the other two don't so you need to grenade jump to it. You will find it floating.

If you shoot at it, the bullets will go through it, but if you melee it, you will hear a metal sound. The same with grenades; nothing will happen to it.