When Katai makes herself known by sending a volley toward the Dark Jedi, Rand directs the trigger-happy Relle at a support beam in their current location- an easier target than the wall-walking woman. He orders her to take it out as they make their way across the room, lasers zipping down at them from above. Once she blasts it up to weaken it, Rand reaches up with what focus he can muster and makes the final pull to bring the ceiling down, either throwing off Katai or separating them from her for a needed moment. He knows Gallador will join him and ensure the plan works, with what added pull he can provide.
"Keep moving!" Rand urges. "We cannot fight her in this state!"
Four successes from Rand is enough! The ceiling cracks and wavers and, as Katai was running on it at the time, she has to jump back down to the floor to avoid it. That gives you guys a chance to move!
Relle is first, then Gallador, and Rand brings up the rear. However, as it turns out, up the narrow stairs to the west is a security door leading t an elevator. The other Agent is there, hammering furiously on it, begging to be let in...