You are not required to drop everything and become a statue every time a TSA agent yells FREEZE

Playing Simon Says at Airport Security - NYTimes.com: "Understood, I said. But still, am I, a citizen, required to stop motionless when the T.S.A. officers yell “freeze”?

Actually, no. The agency has “wide-ranging legal authority to carry out security-related responsibilities,” Ms Lee said. But in these specific drills, she added, “passengers are not required to ‘freeze’ in place like statues.” But if they are within the checkpoint security area, they may be required to remain there until the drill has ended, she said."