Also, as a brilliant side bonus to all this, Mandalay Bay is no longer shrouded under any fog of confusion.
Turns out some disgruntled members of Saudi Royalty were attempting to take out the Crown Prince while he was on a visit. Those floors in the hotel are owned by Saudis.
Edit: Also, for clarity, whatever group Q is may not be NSA, or entirely NSA, but it has been confirmed that they work closely with the president. Another leading theory is that they are those members of the cabinet and military with Q clearance and above.