citadel - big hall, help

I have come up the big lift in the citadel, come through some passages jumped down a drop into a big hall. Here I killed some baddies and destroyed the big spidery thing with the energy balls from the two streams of them. Now I am stuck in the hall. I presume I somehow destroy the energy field at the far end. I have tried removing the energy balls, shooting energy balls at the glowing pillar thing and even throwing bits of broken spidery thing at it but nothing happens

Help

you have to use the force!.......

right after the Strider, go left and at the end of the hall theres a forcefield I think, take all the balls out of the tube behind it.