There are multiple ways of making this jump, but I have found this one to be the easiest way. Learning how to make this jump on the fly, 99% of the time, will help your DM2 game considerably. This will save you the time of having to hit the button, run all the way around, and use the bridge. See demo for more details. See demo.
 
1. Place yourself in the center with your back to the wall, between the pillar and the wall in the corner.
 


Placing Yourself Correctly.



 
2. Aim the crosshair at the dark spot in the center of the ledge where the RA rests, or directly at the RA.
 


Aim the Crosshair.


 
*If you find yourself falling short of the RA ledge, or jumping into the lava on your first jump, then you are aiming too far to the left.
**If you find yourself hitting the wall to your right, then you are aiming too far to the right.
 
3. Almost a split second after you hit forward, hit jump to hop onto the first ledge, then jump again as quickly as possible to jump onto the RA ledge. (Hold forward through this entire sequence)
 
*If you find yourself jumping past the first ledge, then you are hitting jump too late.
 
4. You're there!

Although it is very feasible to simply jump across the lava to the RA ledge in one jump, I strongly recommend not doing it. It is a lot safer to do the double jump or rocket jump across than to try to make the jump. Anyone with a ping over 50ms should not even consider trying it. There is no conclusive way of making this jump, as the time and place you hit jump really depends on what ping you have. Again, I would recommend either rocket jumping (if you are short on time) or double jumping across rather than attempting this jump. See demo.

This is probably the quickest, easiest, and most reliable way of getting to the RA ledge. Do a backward rocket jump (see backward rocket jump for details), and as long as you hold down backwards, you'll end up on the RA ledge. See demo.

Next: Quad Stuff