If you aren't interested in achievements/trophies, skip to the next section. If you want this one, you may want to save the game here, unlock the achievement/trophy, then reload, avoiding a little backtracking.
After subduing the first two guards with stealth, as shown in the previous section, pick up the M-V9 ammo (11-12) they drop, but do not use the switch in the DJ booth yet. Doing so turns on the hot disco beats, alerting more guards.
Climb the stairs opposite the bar.
Follow the walkway (in either direction) around to the other side of the room.
Push the movable speaker cabinet out onto the balcony.
Climb on top of the speaker, step to the edge, and jump straight up to grab the metal truss above. Pull up.
Walk out along the truss toward the middle of the room.
The perpendicular truss ahead collapses, and as long as Lara hasn't been spotted by any guards so far, the "Hit the Floor" achievement/trophy should unlock. Now, either reload your last save or climb back down to the floor the way you came.
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