What Melon said. RL is by far the best option if you can afford the rockets. Although to be honest, you're closer to the other side of the room by the time the walls collapse. If you don't need the door, you could destroy it ahead of time (just fire at it) and run for that opening instead. The UV Viles are nearer the first room, so this is probably the better option.
Additionally, you could just phase outta there. The walls still fall down if you pass the column (and, should there be imps, they can open the door) but it does make things a bit simpler. If you're having trouble with the first wave...heh. You'll enjoy the second.