The lower posture can save their lives better than the element can in many cases. This means that, as in earlier missions, you must take it upon yourself to cuff the hostages as they submit during the tough initial fight. The task seems daunting, perhaps even impossible. One factor you must be aware of is the multiple entry points that the suspects have. They can enter the main area atop the escalators and from the meeting rooms, stairs, and escalators.
Suspects can come up the stairs from the first floor and the basement.
A living drama is being acted out on the escalators on the other side of the separator and sometimes its actors come and join the fun upstairs. For the most part, if the element is upstairs, the suspects behave themselves when they are on the first floor. This does not mean that they won't try to pick off your officers, however. When the element has the situation under control, search the meeting rooms on your own. Of course, if you don't feel comfortable doing this, you can split the element and bring a team along as backup.